JPS63118962A - Processor having non-volatile memory - Google Patents

Abstract

PURPOSE:To obtain a device with resulting no malfunction, by writing a data represnting a processing state on a non-volatile memory when the drop of a power source voltage is detected. CONSTITUTION:The output lowering detection circuit 551 of a power source monitoring circuit 55 sets a power source lowering detection signal at an L level at a prescribed time immediately after the applying of a power source, and at a time when the constant voltage VCC of +5V that is the output of constant voltage power source circuit goes down less than +4.5V. Based on the above state, an MPU50 saves the content of a CPU register at need by performing an interruption processing. And after the lapse of a prescribed short time, the above stated power source output lowering detection signal (L level) delayed by a delay circuit 552 is outputted as a reset signal. Thereby, the MPU50, an S1CPU62, an S2CPU63, an S3CPU, and an I/O device 56 are initialized, and the chip select of a RAM531 and a real time clock 532 are disabled via a battery backup circuit 533, then, read and write are prohibited.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of the Invention The present invention relates to a processing device equipped with a non-volatile memory such as a battery backup memory, and particularly to prevention of malfunction when the power supply voltage drops.

2. Prior Art For example, in some types of copying machines, each component is precisely controlled by a microprocessor, etc., so that copies can be made in response to a wide variety of operator requests.

In this case, the operator's key operations to set the operation mode (conditions for making copies) of the copying machine become more complicated as the machine becomes more multi-functional. Operation is simplified. In this system, a memory is provided for storing the parameters of the operating mode of the copying machine, and this memory contains, for example, one.

Write several sets of parameters in association with the numbers (operation mode registration). After that, if necessary, read the parameters of the number set corresponding to the desired operation mode and set the copying machine to that mode ( operation mode call)
Since the operation mode once registered is used repeatedly, the memory in this case is preferably a readable/writable nonvolatile memory such as a battery backup memory that retains the stored contents even after the power is turned off.

By the way, in a device equipped with a control means such as a microprocessor as described above, if the power is cut off while the control means is in operation, to what extent can the processing being executed be guaranteed? Here, as an example, consider a case where the power is cut off while the microprocessor is writing to the battery backup memory.

The memory is backed up by a battery and functions even after the power is turned off, but since the microprocessor is not backed up, there is a possibility that it will malfunction and write erroneous data as the power supply voltage drops.

In other words, there is no guarantee of the data written at this time. However, battery backup memory retains the data written at that time, regardless of whether there is an error or not, so the next time the data is read, if it is erroneous data, the microprocessor will malfunction (more precisely (operation based on erroneous data).

As a solution to this kind of inconvenience, there is a circuit as shown in FIG. In this case, the RAM is a random access memory, and when the H level is applied to the chip select terminal C8, the read instruction signal RD from the microprocessor μPU (because it is L active, the fourth
Overlined in the figure, but omitted in the explanation:
Reading and writing are controlled by a write command signal WR (hereinafter referred to as "middle") and a write instruction signal WR. The microprocessor μPU stops operating when there is an L-level reset signal.

The voltage applied to the power supply input terminal Vcc of the RAM is:

When there is no abnormality, the system power supply is 5V obtained by stabilizing the voltage of the commercial power supply, but when this system power supply voltage drops, the 3V battery B is supplied by the action of the transistor switch.
t, t, continuously. The voltage of the battery Btt, 3V, is sufficient to hold the memory contents of the RAM.

The power-down detection circuit DET operates when the system power supply voltage is 4.
When the system power supply voltage falls below 75V, a power down signal PD of L level is output and given to the microprocessor μPU, and the reset circuit R3T outputs an L level power down signal PD when the system power supply voltage falls below 4.5V.
The microprocessor μ outputs a level reset signal.
It is applied to the chip select terminal C8 of PU and RAM.

FIG. 5 shows a waveform diagram showing the relationship between the voltage applied to the power supply input terminal Vcc of the RAM, the power down signal PD, and the reset signal. In FIG. 5, the horizontal axis indicates time.

To explain one mode of operation of this circuit, the microprocessor μPU executes writing to the RAM only when the power down signal PD is at the H level (naturally, the reset signal is also at the H level). When the system power is turned off, the time required for the voltage to change from 5v to 4.75v to 4.5v is sufficient to complete the write process to the RAM that is already being executed. Therefore, in this mode of operation, writing is guaranteed for data that is currently being written. However, since the data that was scheduled to be written at that time disappears, this does not solve the above-mentioned malfunction.

To explain another operating mode, the microprocessor μPU
When the power down signal PD changes from the H level to the L level, one interrupt process generates data indicating the processing status at that time, that is, the program counter, accumulator, and status word.

Writes the contents of so-called CPU registers such as the stack pointer to RAM. Thereafter, when the system power is restored, predetermined data is read from the RAM, the CPU register is reset, and processing is resumed from where it was interrupted. According to this, since data writing is completely guaranteed, the above-mentioned malfunction will not occur. However, the above interrupt processing needs to be performed prior to the reset signal.

The detection voltage of the power-down detection circuit must be set to a certain degree higher than the detection voltage of the reset circuit (in this case, 0.25V). Therefore, due to fluctuations in the system power supply voltage, although the system does not reset, the power It may happen that the down signal changes to L level and an interrupt request is generated. Especially when using commercial power,
If other equipment that consumes large amounts of power intermittently is connected to the same commercial power line, voltage fluctuations of approximately ±5% may occur even if a constant voltage circuit is inserted into the system power circuit. Fluctuations can occur frequently. In such a case, it is not preferable to interrupt the process currently being executed and execute the interrupt process each time, as this will result in a timing shift in the main process, an increase in processing time, and the like.

In addition, in any of the operating modes of the conventional device described above, as shown in FIG.
and a reset circuit R8T), which increases the complexity of the device and increases the cost.

Although we have explained here the problems associated with a drop in power supply voltage during write processing to RAM, similar problems can also be pointed out if the power supply voltage drops while the microprocessor μPU is executing other processing. .

■Object of the Invention The object of the present invention is to provide a processing device that does not malfunction when the power output decreases.

■Structure of the Invention In order to achieve the above object, the present invention includes: power supply output monitoring means for monitoring the output of a power supply and outputting a first detection signal when the output is below a predetermined value; Delay means for outputting a second detection signal with a time delay; Non-volatile memory means for freely reading and writing data; Program memory means for storing a program; and a second detection signal driven by the power output. processing means for executing a program stored in the program memory means initialized as follows;
When there is a detection signal, the processing is interrupted and data indicating the processing state at that time is written into the non-volatile memory means, and thereafter, when the first detection signal and the second detection signal are no longer present, the processing state is written from the non-volatile memory means. electronic processing means for reading data indicated and re-executing the program based on the data.

According to this, since the second detection signal is generated by delaying the first detection signal by a predetermined time, there is no possibility that only one of the signals is generated. By setting a single reference value, processing can be interrupted and data indicating the current processing state written to non-volatile memory only when the power supply output drops and the electronic processing means needs to be stopped. This eliminates unnecessary interruption of processing due to slight fluctuations in power output.

In addition, the data written to the non-volatile memory is retained even after the power is turned off, so when the power output is restored and the first and second detection signals disappear, the required data is read from the non-volatile memory and the process is interrupted. It is possible to reproduce the processing conditions at that time. In other words, since the interrupted process can be restarted from the state at the time of interruption, it is possible to completely prevent malfunctions caused by a drop in power output.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

FIG. 2 shows an outline of the mechanism of a copying machine embodying the present invention as an example. This will be explained with reference to FIG.

Reference numeral 1 is a contact glass on which a document is set, and reference numeral 2 is an automatic document feeder/discharge device (hereinafter referred to as an ADF device) which also serves as a pressure plate.

The original may be set directly on the contact glass 1 with the pressure plate 2 opened, or the ADF device may be set on the document mounting table 2 (on the right side of the ADF device 2 in FIG. 2). In the latter case, use an ADF device! 2) When a document is detected on the document table, the copy start instruction input becomes an ADF start instruction, and the document is fed into the contact glass 1.
After setting the ADF device i! to the specified position, 2 issues a copy start instruction. What is the operating mode of this ADF device 2?

There are two ways. The first is copy start instruction manual → manuscript #! The ADF mode continues until all the originals on the document tray are used up, such as loading the document on the document tray → copying → ejecting the original and loading the next document → etc. The second mode is manual input of copy start command → original A on the document tray. This is a 5ADF mode in which the process is as follows: loading the original → copying → discharging the original → waiting for input of a copy start instruction.

In both cases, when the original is set directly on the contact glass 1 and when the ADF device is used, the original is pressed down by a white belt stretched across the contact surface of the ADF device 2 with the contact glass 1. It is brought into close contact with the contact glass 1.

Below the contact glass 1, an exposure lamp 3, a first mirror 4. An optical scanning system including a second mirror 5, a third mirror 6, a condensing lens 7, a fourth mirror 8, etc. is provided. Light reflected from the original by exposure lamp 3 is guided to photoreceptor drum 9 by this optical system. The copying apparatus of this embodiment is of a document fixed type, and includes a first carriage (not shown) equipped with an exposure lamp 3, a first mirror 4, etc.;
A second carriage (not shown) carrying a second mirror 5, a third mirror 6, etc. is driven at a speed ratio of 2:1, and the original is scanned while keeping the optical path length constant. This document scanning is performed by a photosensitive drum 9 rotating at a constant speed.
(clockwise in FIG. 2), and in the case of full-size copying, the moving speed of the surface of the photoreceptor drum 9 is rω [cm/
5eal (r: radius of photoreceptor drum 9 [cml, ω: rotational angular velocity of photoreceptor drum 9 [rad/5eC1).

The document scanning speed v[cm/5ecl] is set to be equal.

In the case of enlarged copying, if the enlargement ratio is M, the condenser lens 7 moves to the left on the optical axis in FIG.
Since the projected image above is magnified by M times, the original scanning speed v[c
m/see] is the moving speed r (
It is set to 1/M of 11 [cm/sec].

In the case of reduced copying, if the reduction ratio is 1/m, the condenser lens 7 moves to the right on the optical axis in FIG. 2 to reduce the projection on the photosensitive drum 9 to 1/m. Therefore, the document scanning speed v [cm/sec] is set to m times the moving speed rω [cm/5ecl] of the surface of the photosensitive drum 9.

Around the photoreceptor drum 9 are a charger 10° and a developing unit 11. Transfer charger 129 Separation charger 13
．． A cleaning unit 14 and the like are arranged.

There are a total of five paper feed trays, with the first paper feed tray from the top.

They are called a second stage paper feed stand, a third stage paper feed stand, a fourth stage paper feed stand, and a fifth stage paper feed stand. A removable paper feed cassette 15, 18, 21°24.27 is attached to each paper feed tray.

This copying apparatus can feed up to A3 size recording paper in the longitudinal direction (hereinafter referred to as "horizontal feeding"; on the other hand, paper feeding in the transverse direction is referred to as "vertical feeding"). Therefore, for A3 horizontal feeding, for A4 vertical feeding, for A4 horizontal feeding, for A5 vertical feeding, for A5 horizontal feeding, for B4 horizontal feeding, for B5 vertical feeding, for B5 horizontal feeding, Eleven types of paper feed cassettes are available: B6 vertical paper feed, B6 horizontal paper feed, and universal paper feed (free size).

These paper feed cassettes are equipped with a detection mark that indicates the type (paper size accommodated), and when the cassette is installed, the paper size detection sensor (1a
57) shown in the figure. Specifically, the size detection sensor (57) is a photo interrupter,
When the cassette is installed, the light-shielding filler of the detection mark enters,
Read the type of paper feed cassette installed by transmitting light/shielding light (separately, there is also a method of using a magnet as the detection mark and reading it by turning on/off a magnetically sensitive reed switch). It is shown in Table 1.

Table 1 However, in Table 1, "0" indicates light transmission (no light blocking filler), and "rl" indicates light blocking (with light blocking filler).

When the first paper feed table is selected, the recording paper stored in the paper feed cassette 15 is fed out by the paper feed rollers 16 and feed rollers 17 toward the registration rollers 30.
When the second stage paper feed tray is selected.

The recording paper stored in the paper feed cassette 18 is transferred to the registration roller 3 by the paper feed roller 19 and the feed roller 20.
When the paper is fed out toward 0 and the third stage paper feed tray is selected,
The recording paper stored in the paper feed cassette 21 is fed out toward the registration rollers 30 by the paper feed roller 22 and the feed roller 23.48, and when the fourth stage paper feed table is selected, the paper feed roller 25 and the feed roller 23. The recording paper stored in the paper feed cassette 24 is fed out toward the registration roller 30 by the roller 26.47° 48, and when the fifth stage paper feed tray is selected, the paper feed roller 28 and the feed rollers 29, 45 are fed out. , 46, 47, 48, the paper feed cassette 27
The recording paper housed in is fed out toward the registration rollers 30.

The registration roller 30 feeds the recording paper fed out at a predetermined timing to the photosensitive drum 9 (sheet feeding).

On the downstream side of the photosensitive drum 9, a conveyor belt 31. A fixing unit 32 and the like are provided.

The conveyance path of the recording paper after leaving the fixing unit is divided into two paths. One is a paper discharge conveyance path that discharges paper to a paper discharge tray 35 via a paper discharge roller 34 when the switching claw 33 is lowered (the state shown in FIG. 2), and the other is a This is a paper refeed conveyance path that leads to the intermediate tray 36 via feed rollers 39 and 40 when the switching claw 33 is raised (rotated in the direction of the arrow in FIG. 2).

In the double-sided copy mode, when copying the front side, a switching solenoid (not shown) is energized, a switching pawl is rotated, the paper refeeding path is selected, and the recording paper is placed in the intermediate tray 36 with the copy side facing up. Save up. From the paper refeed transport path to intermediate tray 3
The recording paper stored in 6 (with a copy on the front side) is
The right-shifting roller 37, which rotates in the direction of the arrow, shifts the paper to the right side of the intermediate tray 36 in FIG.
42, 43, 44, and 48, it is fed out toward the registration rollers 30. Thereafter, the registration roller 30 sends this recording paper to the photosensitive drum 9 at a predetermined timing, but at this time, the side with the copy is facing down and the back side is the transfer surface.

The intermediate tray 36 has an opening/closing lid on the left side in FIG. 2, and when double-sided copying is to be canceled, the recording paper on which the front side has been copied can be taken out from there.

An overview of the copy process will be explained. The copy process can be divided into a start cycle, a copy cycle and an end cycle.

After operating the operation board and inputting predetermined copy conditions, the operator sets the document and inputs a copy start instruction.

When using the ADF device 2, this instruction becomes an ADF start instruction, and the ADF device 2 retracts the document on the document table, sets it at a predetermined position on the contact glass 1, and then issues a copy start instruction.

In response to a copy start instruction, a start cycle is first executed. The start cycle is performed for the purpose of stabilizing the mechanical drive system and unifying the initial exposure conditions, etc. A drive source such as a main motor is energized, and then, while rotating the photosensitive drum 9, the photosensitive surface is cleaning is performed. In this.

By means of a grounded conductive brush and cleaning blade provided in the cleaning unit 14.

Toner, carrier, etc. that have adhered while the apparatus is stopped are wiped off, and the static electricity is further removed by a static elimination lamp (not shown).

Upon completion of cleaning and neutralization of the photosensitive surface (end of start cycle), a copy cycle is executed.

In this process, charging of the photosensitive surface → electrostatic latent image formation → development →
Transfer is performed in the order of fixing. First, charger 1
0, the photosensitive surface of the photosensitive drum 3 is uniformly charged to a high positive potential, and an eraser (not shown) erases unnecessary areas according to the paper size.

The optical system is energized at a predetermined timing and the exposure lamp 3 is activated so that the exposure of the leading edge of the document matches the leading edge erase end position.
The original is irradiated by the scanner, and the original is scanned by the first and second carriages.

The reflected light of the original is transmitted to the first mirror 4. 2nd mirror 5 and 3rd mirror
When reflected by the mirror 6 and condensed by the lens 7, it is reflected by the fourth mirror 8 and formed into an image on the photosensitive surface of the photosensitive drum 9.

When the photosensitive surface of the photosensitive drum 9, which is uniformly charged to a high positive potential, is irradiated with the reflected light from the original, the surface charge is removed depending on the intensity of the reflected light from the original due to a photoconductive phenomenon, and the electrostatic charge is removed. A latent image is formed.

Since this electrostatic latent image is formed negatively, the developing device 1
1, negatively charged toner adheres and becomes visible (
Developed: positive image).

Before starting exposure, each paper feed cassette 15, 18, 21°24
．． The recording paper fed out from 27 or the intermediate tray 36 to the registration rollers 30 is stopped once in contact with the registration rollers 30, and is directed toward the photoreceptor drum 9 at a predetermined timing according to the rotation of the photoreceptor drum 9. will be sent.

When the recording paper passes directly above the transfer charger 12 to which a predetermined voltage is applied, it comes into contact with the toner image formed on the photosensitive surface of the photosensitive drum 9, and the toner image is transferred.

That is, the registration roller 30 maintains a feeding speed Vp[ which is equal to the moving speed rω[cm/sec] of the surface of the photosensitive drum 9 so that the leading edge of the toner image and the leading edge of the recording paper are exactly aligned.
The recording paper is fed out at cm/5eal.

After the 1-toner image has been transferred, the photosensitive surface passes through the cleaning unit 14 and is cleaned and neutralized to remove residual toner and carrier in the same manner as described above.

The recording paper onto which the toner image has been transferred is separated from the photosensitive surface of the photosensitive drum 9 by a separation charger 13 and a separation claw (not shown), and then transferred to a fixing unit 32 by a conveyor belt 31.
sent to. The fixing unit 32 is a pair of rollers with a built-in heater, and the toner image on the recording paper is fixed here.

Here, for copying in single-sided copy mode (outside double-sided copy mode) or back-side copying in double-sided copy mode, a switching drive solenoid (not shown) for the switching pawl 33 is used.
Since the switching claw 33 is not energized, the switching claw 33 is lowered, and the recording paper that has left the fixing unit 32 is transferred to the paper ejection roller 34.
If the front side copy is in the 6-sided copy mode where the paper is ejected to the paper ejection tray 35 via the The recording paper that has exited the fixing unit 32 is guided to the intermediate tray 36 via feed rollers 39 and 40.

After repeating the above copy cycle for the set number of sheets, in the end cycle, the photosensitive drum 9 is further
Rotates to clean and neutralize the photosensitive surface. This end cycle is performed to maintain stability and protect the photosensitive surface of the photosensitive drum 9, so the processing content is the same as the start cycle, and if a copy start instruction is issued while the end cycle is being executed, the start cycle will be omitted. and execute from the copy cycle.

FIG. 1a is a block diagram schematically showing the control system of the copying apparatus shown in FIG. 2, and FIG. 1b is a block diagram showing a part of the control system in detail. Description will be given with reference to these drawings. Note that in Figures 1a and 1b, the overline indicates that the terminal is L active, and the overline is omitted in the explanatory text.)
, Vcc indicates a terminal to which the constant voltage supplied from the constant voltage power supply circuit 54 or the constant voltage Vcc is applied.

This control system includes a main microcomputer (hereinafter referred to as MCPU) 50 that has a built-in A/D conversion circuit,
Three sub-microcomputers (hereinafter referred to as SlCPU)
, 52 CPU, 53 CPU).

The MCPU 50 centrally controls this control system, and its pass line includes a read-only memory (ROM).
52. A nonvolatile RAM unit 53, a power supply voltage monitoring circuit 55, an I10 device 56, an S I CPU 62, and the like are connected. Decoder 51 and latch circuit 61
is the bus driver.

The ROM 52 mainly stores control programs necessary for controlling the copying apparatus.

Non-volatile RAM unit 53 is read/write memory RAM5
31. It consists of a real-time clock 532 and a battery backup circuit 533.

Each processing parameter (copy condition) required for each copy process is sequentially written into the RAM 531 and read out as necessary.
The M531 has a non-volatile memory area with battery backup, in which multiple sets of processing parameters are associated with numbers.

For maintenance purposes, various data such as data on the number of jam occurrences for each jam occurrence location and usage start and end times for each day of the week are stored.

The battery backup circuit 533 includes a battery (lithium battery) BT, and receives a constant voltage V from the constant voltage power supply circuit 54.
When cc is disconnected, a battery voltage of 3V is applied to RAM 531 and real-time clock 532.

The power supply voltage monitoring circuit 55 includes an output drop detection circuit 551 and a delay circuit 552.

The output drop detection circuit 551 operates for a predetermined period of time immediately after the power is turned on.
and +5v constant voltage Vc of the constant voltage power supply circuit 54 output.
When c becomes +4.5v or less.

Outputs an L level power output drop detection signal. This power output drop detection signal is sent to the interrupt input terminal NMI of the MPU 50.
and is applied to the input terminal of delay circuit 552.

When the interrupt input terminal NMI goes to L level, the MPU 50 performs interrupt processing to output data indicating the processing state at that time, that is, so-called C data such as a program counter, an accumulator, a program status word, a stack pointer, etc.
The contents of the PU register are written to the RAM 531 as necessary.

The delay circuit 552 consists of a resistor, a capacitor, etc.
A reset signal (RESET) is output by delaying the power supply output drop detection signal by a predetermined short time.

This reset signal is for MCPU50, 5ICPU62S
It serves as a reset input for the 2CPUs 63 and 53CPUs, the I10 device 56, and the battery backup circuit 533.

MCPU50,5ICPU62S2CPU63°53C
When an L level reset signal is applied to the PU and I10 devices 56, these elements are immediately initialized.

When an L level reset signal is applied to the battery backup circuit 533, the transistor T r 1 .

Tr2, Tr3 and Tr4 are in a cutoff state. As a result, the constant voltage input terminal (Vcc
) and chip select input terminal CE.

Further, a +3V battery BT output is applied to each constant voltage input terminal (Voo) of the real-time clock 532, and a ground level is applied to the chip select input terminal C81 of the real-time clock 532. In other words, the chip select of RAM 531 and real-time clock 532 is disabled, and reading and writing to these is prohibited.

When a predetermined period of time has passed after the power is turned on, or when the constant voltage Vcc of the constant voltage power supply circuit 54 is recovered, the output drop detection circuit 5
Since 51 converts the power output drop detection signal to H level,
After a predetermined short time, the reset signal becomes H level. As a result, the base current flows to the transistor T r 1 via the Zener diode ZD1, so that the T r 1
is turned on, and furthermore, transistors Tr2, Tr3, and Tr4 are also turned on. Therefore, a +5V constant voltage Vcc is applied to the constant voltage input terminal (Vcc) of the RAM 531, and an L level is applied to the chip select input terminal GE, so that reading and writing to the RAM 531 is possible, and the constant voltage of the real-time clock 532 is applied. Since a constant voltage Vcc of +5V is applied to the voltage input terminal (Vo port) and an H level is applied to the chip select input terminal C81, it is possible to read and write the real-time clock 532.

In this state, the MCPU 50 gives a read instruction equal code RD to the RAM 531 to read data indicating the saved processing state, and if there is an interrupted process, it continues that process. For example, if the output of the constant voltage power supply circuit 54 drops and the operation is interrupted while the MCPU 50 is executing a write process to the RAM 531, the data to be written and the program counter at the time the process is interrupted. Since the values and the like have been saved, they are read out, the CPU register is set, and the write process is continued from where it was interrupted. After this, as usual, use RAM5 as needed.
31 is a read instruction signal RD or a write instruction signal W.
Read or write data by giving R,
Further, a read instruction signal RD or a write instruction signal WR is applied to the real-time clock 532 to read or set the time.

To summarize, the output drop detection circuit 55 of the power supply monitoring circuit 55
1 sets the power supply output drop detection signal to the L level for a predetermined time immediately after power-on and when the constant voltage Vcc of +5V output from the constant voltage power supply circuit becomes +4.5V or less. As a result, the MPU 50 performs interrupt processing and
Save the contents of the PU register. When a predetermined short time has elapsed, the delay circuit 552 outputs an L-level reset signal that is a delayed version of the power output drop detection signal, and the MCPU 50.
5 ICPU62, 52CPU63, 53CPU and I
10 device 56 is initialized and chip select of RAM 531 and real-time clock 532 is disabled via battery backup circuit 533 to prohibit reading and writing.

After this, even if the output of the constant voltage power supply circuit 54 is cut off, the RA
M531 and real-time clock 532 are backed up by battery BT of battery backup circuit 533.

After a predetermined period of time has passed immediately after the power is turned on, or when the constant voltage V
When ec recovers, the power supply monitoring circuit 55 output drop detection circuit 551 changes the power supply output drop detection signal to H level, so when a predetermined period of time has passed, the reset signal output from the delay circuit 552 becomes H level, and the MCPU 50, 5ICP
U62,52CPU63S3CPU and I10 device 56 are enabled. Further, when the reset signal becomes H level, the chip select of the RAM 531 and the real-time clock 532 is enabled via the battery backup circuit 533, and the read/write prohibition is canceled. At this time, if there is a process that has been interrupted due to an interruption in the output of the constant voltage power supply circuit 54, the CPU register is set with the data read from the RAM 531 and the process is continued.

Note that the nonvolatile RAM unit 53 is integrated into one unit as shown in FIG. 1c, and has a 28P connector (P
It is detachably connected to the main control board provided with the MCPU 50 and the like via IN and C0NN). In other words, since the non-volatile RAM unit 53 can maintain the operation of the RAM 531 and the real-time clock 532 by itself, when there is some problem with the elements provided on the main control board and the main control board needs to be replaced, Only non-volatile RAM unit 53 can be used continuously. As mentioned above, since various data are stored in the RAM 531 and the real-time clock 532, the inconvenience of re-registration and data disappearance can be solved.

By the way, RAM 531 and real time clock 5
Since the battery BT backing up the battery 32 is not rechargeable, it gradually wears out and its voltage drops.

When the battery BT voltage drops to approximately +2.5v, the RAM
531 and the real-time clock 532 may malfunction. Therefore, analog boat A of MCPU50
Input the output voltage of the battery BT to NO, monitor the voltage at any time, and if it goes below +2.8v, a warning will be displayed (
Bit) in FIG. 3 is performed to notify the need for battery replacement.

The time it takes for the voltage of the battery BT to drop from a new state (+3V) to +2.8V due to wear and tear varies depending on the usage condition, but in this embodiment, the standard usage time is approximately 5 years.

The I10 device 56 includes a size detection sensor 57 and its decoder driver 58 . A motor and solenoid driver 59, a sensor unit 60, etc. are connected.

The decoder driver 58, in response to a reading instruction from the MCPU 50, sets the reading of the detection mark on the paper feed cassette from the first stage paper feed tray to the fifth stage paper feed tray depending on luck.

The size detection sensor 57 includes four sets of five photointerrupters for reading each bit of each paper feed tray connected in parallel;
5 for detecting the presence or absence of recording paper on each paper feed tray connected in parallel
It consists of one set of two reflective photosensors. That is, when the decoder driver 58 is set to read the first stage paper feed tray, four photo interrupters for reading each bit are used to detect the detection mark ( (see Table 1) and the presence or absence of recording paper in the paper feed cassette with a reflective photo sensor; if the decoder driver 58 is set to read the second stage paper feed tray, each bit is read. The four photo interrupters for the 2nd stage paper feed table read the detection mark on the paper feed cassette mounted on the second stage paper feed table, and the reflective photosensor reads the presence or absence of recording paper in the paper feed cassette: Detection mark on the paper feed cassette installed on the third stage paper feed table and presence/absence of recording paper.

Check the detection mark and presence/absence of recording paper on the paper cassette installed in the 4th stage paper feed tray, and check the detection mark and presence/absence of recording paper on the paper cassette installed in the 5th stage paper feed tray. read. In this reading, for each paper feed tray, the MCPU 50 indicates the size of the recording paper (see Figure 1) using the LSB to 3rd bit, indicates the paper feed tray number using the 4th to 6th bits, and uses the MSB to indicate the recording paper size (see Figure 1). 8-bit size data indicating the presence or absence of recording paper is created and written to the size table of the RAM 531 (normal read/write area).

The motor and solenoid driver 59 includes a main motor, a paper feed motor, and each paper feed roller 16, 19, 22°25.28.
The paper feed taratch solenoid 38, the registration clutch solenoid of the registration roller 30, the switching drive solenoid of the switching pawl 33, etc. are connected, and energization/deenergization control of these is performed in response to instructions from the MCPU 50. The sensor unit 60 is connected to a separation jam sensor, a toner sensor (developing unit 11), a drum (photosensitive drum 9) temperature' sensor, a P sensor, and the like.

Input port PIO, pH and output port P20 of S lCPU62. P21 is connected to the control input/output terminal of the ADF device 2 and the sorter (not shown) via a connector, and performs serial data communication from here.
Executes control of DF2 and sorter. Input port P14. P15° PI3 and a dip switch DIPsw connected to PI3 are for specifying the type of ADF2 and sorter.

In addition, 52 CPU63 and 53CP are connected to the input port RXD and output port TXD of the MCPU50, respectively.
Output port TXD and input port R of U (not shown)
XD is connected, and data is sent and received serially from here. -82 CPU 63 is provided on the operation board of the copying machine, and reads key operations and controls display.

When reading key operations, output ports PD0 to P
A scan signal is transferred from D7 to driver 1 (64), and signals corresponding to key operations transferred from buffer 1 (65) are read by input ports ANO to AN7. Specifically, in Figure 1a, the key switch consisting of a switch contact and a diode is indicated by a 0 mark, and this is the intersection of the output line of dry/<1 (64) and the input line of buffer 1 (65). It is inserted in
Driver 1 (64) sequentially outputs the high level to the output line according to the scan signal, so buffer 1 (64)
Key operations are read by correlating the level reading of the input line in 5) with the scan signal.

When a key operation is read, it is written to the key operation data store area of the internal RAM by 1 MCPU 50 and 52 CPU 6.
When 3 is selected (select 1), serial read data is transferred from the serial output terminal TXD of the 32 CPU 63 to the serial input terminal RXD of the MCPU 50 in 1 interrupt processing.

In the display, the MCPU 50 selects S2 (:, PU6
3 is selected (select 1), the serial display data output from the serial output terminal TXD of the MCPtJ50 is read from the serial input terminal RXD of the 52 CPU 63 in interrupt processing, and written to the display data store area of the internal RAM.

In response to the scan signal output to the driver 1 (64), the 52 CPU 63 displays the display data from the output ports PBO to PB7 to the driver 2 (66) and from the output ports PAO to PA7 to the driver 3 (67). Output a signal.

Specifically, in Fig. 1a, the indicator lamp made of a light emitting diode is indicated by O, and this is the output line of driver 1 (64), driver 2 (66), and driver 3 (67). When the output line of the driver 1 (64) to which one end of the light emitting diode whose display is instructed by the display data is connected becomes H level due to the scan signal, the other end is connected. The light emitting diode is energized by setting the output line of driver 2 (66) or driver 3 (67) to L level.

The 53 CPU (not shown) includes a first carriage (not shown) on which the exposure lamp 3 and the first mirror 4 are mounted, and
It controls the speed of a second carriage (not shown) on which the second mirror 5 and third mirror 6 are mounted, and controls the position of the condenser lens 7 during zooming. That is, MCPU
By 50.

53 When the CPU is selected (select 2), the MCP
Serial scaling data and size data (recording paper size) output from serial output terminal TXD of U50
etc. are read from the serial input terminal of the 53 CPU and written to the scaling data store area and size data store area of the internal RAM, respectively.

The CPU 53 controls the position of the condensing lens 7 according to the variable magnification data, and also sets the document scanning speed and document scanning range based on the variable magnification data and size data, and when a copy start instruction is received, the document is scanned at a predetermined timing. Perform scan control.

Although not shown, the first carriage carrying the exposure lamp 3 and the first mirror 4 is equipped with a light receiver for detecting the background density of the original, which is led to the background density detection circuit via an optical fiber. (For details, see patent application No. 60-0060.
97). This background density detection circuit output terminal is 53C
Connected to the analog input port of the PU, 53CP
U reads this and stores it in the internal RAM as the original background data.
Stored at. In automatic density adjustment mode, MC
When the CPU 53 is selected (select 2) at a predetermined timing by the PU 50, the original background data is outputted from its serial output terminal to the serial input terminal RXD of the MCPU 50. The MCPU 50 sets a developing bias voltage based on this original background data, and performs optimum density adjustment according to the original.

FIG. 3 shows the appearance of the operation board operated by the operator. This will be explained with reference to FIG.

70 is a program key. This key is an alternate switch that repeatedly sets and cancels the program mode with each key operation.
The indicator lamp 71 lights up.

72 is a mode clear key, which sets the standard mode for each key operation.

Reference numeral 73 is a maintenance key, which repeatedly sets and cancels the maintenance mode every time the key is operated.

76 is a display device that displays various messages in the program mode and maintenance mode.

For example, the specified paper size (RAM
The paper feed cassette (recording paper size specified by the parameter read from the non-volatile memory area of 531) is
~When it is not installed on any of the 5th paper feed trays, a warning to confirm the paper feed power setting and the specified paper size are displayed.
In the maintenance mode, the number of copies for each recording paper size, the usage time for each day of the week, the number of jam occurrences, etc. are displayed in response to input of a predetermined command code.

88 is a print key for inputting a copy start instruction (or ADF start instruction).

This key 88 is a transparent display key switch and has a green lamp and a red lamp behind it.

The green lamp lights up and the red lamp goes off when the machine is set to Ready (copying is possible), and the red lamp lights up when the machine is set to Ready (copying is not possible) (the green lamp goes off).

89 is an interrupt key. This key is an alternate switch, and the interrupt mode is set and canceled every time the key is pressed.When the interrupt mode is set, the interrupt display lamp 9
0 lights up.

91 is a numeric keypad. RAM5 in program mode
In the maintenance mode, the instruction code is input. In the normal input mode (wait mode, which will be described later), the number of copy sets is input. The number of copies set can be set between 1 and 99 copies of the same original, and the set number is displayed on the set number display 94. Reference numeral 95 is a copy number display, which displays the number of copies.

92 is a # key, which is used in program mode. The program mode will be described later. 93 is the C key. This key operation changes the number of copy sets to the initial state (1
sheets).

96 is a double-sided key. This key is an alternate switch, and the duplex mode is set and canceled repeatedly with each key operation.Double-sided display lamp 9 is displayed when duplex mode is set.
7 lights up.

There are two duplex modes; the first is a front copy mode and the second is a back copy mode. In the front copy mode, the duplex display lamp 97 and the front display lamp 98 are turned on, and front copies of the set number of recording sheets are executed.

When this is completed, the back copy mode is set, in which the duplex display lamp 97 and the back display lamp 99 are lit, and the intermediate tray 36 is automatically selected.
Executes a copy of the back side of a recording sheet that already has a copy.

101 is a dark key, and 102 is a light key.

These are key switches used for manual density adjustment. The manual density adjustment of this device has 7 levels, and darker levels (lower numerical values indicating the level) are set sequentially by operating the dark key 101, and lighter levels (higher numerical values indicating the level) are set sequentially by operating the light key 102. Set.

Reference numeral 105 denotes a manual density display, which indicates the level of manual density being set by lighting up a 0 mark. This display 105 indicates a dark stage towards the left.

The right direction shows the thinner stage.

103 is an auto key. This key is an alternate switch, and the automatic density adjustment mode is repeatedly set and canceled each time the key is operated.

When automatic density adjustment mode is set, manual density display 1
The display 05 goes out and the auto display lamp 104 lights up.

100 is an error indicator, from the left: sorter error indicator,
Vapor jam indicator, toner supply indicator.

These are the toner collection indicator and the call service person indicator.

These indicators light up when a corresponding abnormality occurs.

Reference numeral 106 is a paper end indicator, which indicates when no paper cassette is attached to the paper feed tray being set, or when no recording paper is stored in the paper feed cassette attached to the paper feed tray being set. When this happens, this indicator lights up.

Bat is a warning indicator lamp that indicates an abnormality in battery voltage. This indicator lamp lights up when the battery BT of the battery backup circuit 54 falls below +2.8V.

Reference numeral 107 denotes a copy-ready display lamp that lights up when the machine is set to Ready (copy is allowed), and 108 is a copy-prohibited display lamp that lights up when Ready reset (copy is disabled).

109 is a paper key. Each time this key switch is operated, the paper feed tray changes from the 1st tier paper feed tray → the 2nd tier paper feed tray → the 3rd tier paper feed tray → the 4th tier paper feed tray → the 5th tier paper feed tray → the 1st tier paper feed tray. Tier paper feed stand→・
...and update settings.

Reference numeral 110 is a paper size indicator, which displays the size of the recording paper in the paper feed cassettes installed on the paper feed table of each stage (A
3. A4. A5. B4. B5 or B6 display, vertical or horizontal display, or universal (ne) display]
lights up. All displays in the column corresponding to the paper feed tray with no paper feed cassette installed will be turned off.

A paper feed tray that is currently set is displayed by lighting up the outer frame of the corresponding column on the paper size display 110. When no paper feed cassette is installed on the paper feed tray of this stage, or when no recording paper is stored in the installed paper feed cassette, the paper end indicator 106 lights up.

111 is a reduction key, and 112 is an enlargement key. This copying device has a linear ratio of 0.5 to 2.0 (50% in percentage).
-200%) can be set as desired. When the reduction key 111 is operated, the magnification is updated and set to successively smaller values within this range.

When the enlargement key 112 is operated, the magnification ratio is updated and set to successively larger values within this range.

Reference numeral 113 is an equal magnification key, and when this key switch is operated, the magnification ratio is set to equal magnification (100% in percentage).

115 is the Xi, 15 key that sets the magnification to 1.15 times (115% in percentage), and when operated, the Xi
, 15 indicator lamp 116 lights up.

117 is the Xo key that sets the magnification to 0.82 times (82% in percentage), and the 82 key is the Xo key when operated.
82 indicator lamp 118 lights up.

119 is the Xo key that sets the magnification to 0.71 times (71% in percentage), and the 71 key is the Xo key when operated.
71 indicator lamp 120 lights up.

Reference numeral 114 is a magnification ratio display that displays the magnification ratio being set as a percentage.

121 is an ADF/5ADF key. Each time this key is operated, ADF mode and 5ADF mode are set alternately, and while ADF mode is set, ADF display lamp 122 is
Also, while setting the 5ADF mode, the 5ADF display lamp 123
lights up.

124 is a sort/stack key. With each key operation, a sort mode in which copies are automatically collated in a sorter (not shown) and a stack mode in which copies are automatically sorted are alternately set. The stack display lamp 126 lights up while the stack mode is being set.

Referring to the flowchart shown in FIG. 6, the operation of the MCPU 50 shown in FIG. 1a is classified into a plurality of modes according to function. Figure 6 shows typical start modes (
ST mode), initialize mode (IL mode),
Wait mode (WT mode), maintenance mode (
ME mode), program mode (PR mode), emergency mode (EM mode), first mode (FT mode), copy mode (CP mode) and last mode (LT mode) are selectively shown. Programs that execute processing in these modes are further classified using four-digit numbers. By subdividing the process in this way, if the output of the constant voltage power supply circuit 54 decreases during execution of a process and the MCPU is reset, it becomes easy to re-execute only that process when the power is turned on again.

The general operation of the MCPU 50 will be explained with reference to FIG.

As mentioned above, the reset signal of the power supply monitoring circuit 55 is at the L level for a predetermined period of time immediately after the power is turned on, so when the constant voltage Vcc (constant voltage power supply 54 output) is stabilized, input/output ports, internal registers, internal memory, etc. S to initialize
Execute T mode (start mode).

When the ST mode is finished, the IL mode (initialization mode) is executed to initialize the normal read/write area of the RAM 531 and each element connected to the MCPU 50, and change the operation mode of the copying device to the standard mode (copy set mode). Set the number of images to 1, the magnification to 1, etc.).

At this time, the start time is written in the corresponding day of the week column in the nonvolatile memory area of the RAM 531.If there is a process that is interrupted due to a drop in the output of the constant voltage power supply circuit 54 during the operation of the MCPU 50, this 1. This will be re-executed in L mode, which will be discussed later.

Thereafter, a power relay (not shown) is turned on to supply power to each part, and the WT mode (wait mode) is executed. In the WT mode, the operation mode of the copying machine is set by reading the keystrokes on the operation board and a corresponding display is made, and the status of each component is read to detect an abnormality. That is, the number of copies to be copied is set and displayed on the display 94 by operating the numeric keypad 91, the paper feed tray is sequentially changed and displayed on the display 110 by operating the paper key 109, and the number of copies is set and displayed on the display 110 by operating the paper key 109. , 115, 117 or 119 to set the corresponding magnification and display it on the display 114 or 116, 118, 120. Also, if an abnormality is detected, exit the WT mode. Execute abnormality processing in EM mode (emergency mode).

In the EM mode, the operation of the device is stopped, the location where the abnormality has occurred is displayed, and the number of occurrences of each abnormality location is incremented by one and written into the corresponding tank in the non-volatile memory area of the RAM 531.

When the maintenance key 73 is operated in the WT mode, the WT mode is ended and the ME mode (maintenance mode) is executed. In the ME mode, the number of copies to be made for each recording paper valve size stored in the non-volatile memory area of the RAM 531 according to the command code input from the numeric keypad 91, the start/end time of use for each day of the week, and the location where an abnormality has occurred The display 76 reads out various data such as the number of occurrences of each occurrence.
to be displayed.

If the program key 70 is operated in the WT mode, the WT mode is ended and the PR mode (program mode) is entered.
Execute. The PR mode will be explained below.

When the # key 92 and any one of the numeric keys 91 from 1 to 5 are operated at the same time in PR mode, the input value (program number) is displayed, and the RAM 531 is associated with it.
Parameters corresponding to the operation mode of the copying apparatus being set are stored in the nonvolatile memory area of the copying apparatus. However, if there is already a parameter (registered data) registered in association with the input program number and it is protected (update prohibited), 'PE' will be displayed on the display 95 and the operation will be canceled. .After this, press numeric keypad 91 and #
When the key 92 is no longer operated, the PR mode is terminated and the WT
mode is executed, but after registering the parameters, if the # key 92 and numeric keypad 91 numeric value "On" key are operated at the same time, the registered data at this time is protected, and the displayed program number is changed. (For example, when the registered data of program N003 is protected, "P3" is displayed on the display 95).

When the numeric keypad 91 corresponding to a value from 1 to 5 is operated in PR mode, the input value (program N00) is displayed on the display 9.
5, and the corresponding registration data is stored in the RAM 531.
The operation mode of the corresponding copying machine is set by reading the data from the nonvolatile memory area of the copying machine.

At this time, if the corresponding registered data is not stored, 'EP' is displayed on the display 95, and if the registered data is protected, 'P' is displayed in front of the program number. When it runs out, the PE mode is terminated and the WT mode is executed. However, if the numeric keypad 91 is operated and the protected registered data is read out, then the C key 93 is operated in duplicate with the numeric keypad 91 operation, the protection is disabled. unlock.

When the print key 88 is operated in the WT mode, the WT mode is terminated and the FT mode (first mode), the CP mode (copy mode) and the LT mode (last mode) are executed in this order. The FT mode is a mode for executing the start cycle described above, the CP mode is a mode for executing the copy cycle, and the LT mode is a mode for executing the end cycle. Therefore, the CP mode is repeatedly executed for the number of sheets set. In addition, in CP mode, the total counter that counts the total number of copies made by the copying device and the size counter that counts the number of copies for each recording paper size are incremented by 1 and the value is R.
Store in the nonvolatile memory area of AM531. When the LT mode is finished, the WT mode is set. Note that if an abnormality is detected while executing the FT mode, CP mode, and LT mode, each mode is immediately terminated and the 2M
Run mode.

While performing the above processing, when the output of the constant voltage power supply circuit 54 decreases and a power supply output drop detection signal is output, the MCPU 50 executes an interrupt process.

If this interrupt processing occurs during the execution of a program that needs to be re-executed after the power is restored (returned on), data indicating the current processing state is saved in the nonvolatile memory area of the RAM 531.

71st! Referring to FIG. 1, an example will be described in which the power output drop detection signal changes to L level and an interrupt occurs during execution of the routine CP9800 for incrementing the total counter and size counter by one in the CP mode. This program is executed when paper ejection is detected, but if it is interrupted due to a drop in power output, it needs to be re-executed after the power is restored, so a data save flag is set.

This flag consists of 8 bits as shown in Figure 8, and the θth to 6th bits correspond to the internal registers of the MCPU 50, and when data needs to be saved, the corresponding bits are set to 1. be done. Furthermore, when setting the data save flag, the seventh bit is set to 1.

When the power supply output drop signal changes to L level and an interrupt request occurs when the total counter is counted up by 1,
The contents of the program status word and program counter at that time are saved to the stack pointer, and the interrupt processing routine NO400 is called to save the data.
After checking I and confirming that it is not noise, store the data evacuation flag in the corresponding area of the non-volatile memory area of the RAM 531, and write the end time of use of the copying machine in the column for each day of the week. Looking at the contents of , since this flag is set, the contents of the register designated to be saved and the contents of the stack pointer are written to the corresponding non-volatile memory area of the RAM 531. Here, saving of the register that stores the recording paper size data is specified.

Further, the stack pointer stores the program status word and the contents of the program counter at the time of occurrence of the interrupt. Note that when the data save flag is reset, the register and stack pointer are not saved.

Thereafter, while waiting for a predetermined time to elapse, the delay circuit 552 outputs an L-level reset signal, and each component including the MCPU 50 is reset.

The output of the constant voltage power supply circuit 54 becomes normal, and the delay circuit 55
When the reset signal 2 becomes H level, S
Run T mode and IL mode. In IL mode,
Routine IL that re-executes the process that was interrupted due to a drop in power output
When O100 is executed and the data save flag is read from the RAM 531, this flag is set, so the saved data is read from the corresponding area of the RAM 531 and the register, program status word, and program counter are set. As a result, immediately
Since the process interrupted by the power output, that is, the interrupted point of the routine CP9800 that increments the total counter and size counter by 1, determines the paper size and sets the corresponding size counter (for example, if the paper size data is A2 size). When indicating the A3 size, the A2 counter is incremented by one count, and when indicating the A3 size, the A3 counter is incremented by one count, etc.), and after storing the value in the corresponding non-volatile memory area of the RAM 531,
Reset the data save flag and return to IL mode.

In this way, the correct total counter value (the total number of copies made by the copying device) and the size counter (the number of copies for each recording paper size) are recorded in the RAM 531. Further, other processes of the MCPU 50 are also executed in substantially the same manner as described above.

In the above embodiment, a copying machine was used as an example, but
It is not intended that the invention be limited thereto.

For example, by applying the present invention to a facsimile, printer, etc., it is possible to guarantee processing when the power output decreases or when the power output is cut off.

(2) Detailed Description of the Invention According to the present invention, the second detection signal is generated by delaying the first detection signal by a predetermined period of time, so that only one of the detection signals is generated. It is also possible to define one suitable reference value for comparison with the power supply output, only when the power supply output decreases and it is necessary to stop the electronic processing means.

Since the processing is interrupted and data indicating the processing state at that time is written to the nonvolatile memory, the processing will not be interrupted unnecessarily due to slight fluctuations in the power output.

In addition, the data written to the non-volatile memory is retained even after the power is turned off, so when the power output is restored and the first and second detection signals disappear, the required data is read from the non-volatile memory and the process is interrupted. It is possible to reproduce the processing conditions at that time. In other words, since the interrupted process can be restarted from the state at the time of interruption, it is possible to completely prevent malfunctions caused by a drop in power output.

[Brief explanation of the drawing]

FIG. 1a is a configuration block diagram of a control system for a copying machine showing an embodiment of the present invention, FIG. 1b is a block diagram showing a detailed configuration of the nonvolatile RAM unit 53 shown in FIG. 1a, and FIG. 5 is a perspective view showing the appearance of a nonvolatile RAM unit 53. FIG. FIG. 2 is a sectional view showing an outline of the mechanism of a copying apparatus according to an embodiment. FIG. 3 is a plan view showing the external appearance of the operation board of the device shown in FIG. 2. FIG. 4 is a block diagram showing the conventional example, and FIG. 5 is a waveform diagram showing the drawbacks of the conventional example. 6 and 7 are flowcharts showing the general operation of the main microcomputer 50 shown in FIG. 1a. FIG. 8 is a plan view showing the structure of the data save flag shown in FIG. 7. 1: Contact glass 2: Automatic document feeder that also serves as a pressure plate 3: Exposure lamp 7: Condensing lens 4.5, 6, 8
: Mirror 9: Photosensitive drum 10: Charger 11: Developing unit 12: Transfer charger
13: Separation charger 14: Cleaning unit 15.1g, 21, 24, 27, paper feed cassette 16.
19, 22, 25. 28. 38: Paper feed roller 17.20
,23,26,29,39,40,41,42,43,
44, 45, 46° 47.48: Feed roller 1 30 Registration roller 31: Conveyance belt 32: Fixing unit 33: Switching claw 34: Paper ejection roller 35: Paper ejection tray
36: Intermediate tray 37: Right alignment roller 50, 62, 63: Microcomputer 50: (electronic processing means) 51: Decoder 52: Read-only memory (program memory means) 53: Non-volatile RAM unit (non-volatile memory means) 531: Read/write memory (memory means) 532: Real-time clock 533: Battery backup circuit (switching means) 54:
Constant voltage power supply circuit (power supply) 55: Power supply monitoring circuit 551: Output drop detection circuit (power supply output monitoring means) 552
: Delay circuit (delay means) 56: I10 device 57: Size detection sensor 58
:Decoder driver 59:Motor & solenoid driver 60:Sensor unit 61:Latch circuit 64, 66.67:Driver 65:Buffer 70 Niprogram key 71
Niprogram mode display lamp 72; Mode clear key 73: Maintenance key 76: Display 88 Niblint key 89: Interrupt key 90: Interrupt display lamp 91: Numeric keypad 92: # key 93: C key 94
:Set number display 95:Copy number display 96:Double-sided key 97:Double-sided display lamp 98:Front display lamp 99:Back display lamp 100:Error indicator 101
: Dark key 102 Light key 103: Auto key 104: Auto indicator lamp 105: Manual indicator lamp 106: Paper end indicator 107: Copy possible indicator lamp 108: Copy not possible indicator lamp 109: Paper key 110: Paper size indicator 1
11: Reduction key 112: Enlargement key 113: Same size key 114: Magnification ratio display 115: Xl,
15 keys 116: xi, is display lamp 11
7: Xo, 82 key 118: Xo, 8
2 Display lamp 119: X0671 key 120:
Xo, 71 display lamp 121: ADF/5ADF key 122: ADF display lamp 123: 5ADF display lamp 124: Sort/Stack key 125: Sort display lamp 126: Stack display lamp BT: Battery (auxiliary power supply) Bat: Warning indicator

Claims (2)

[Claims] (1) Power supply: Monitor the output of the power supply, and when the output is below a predetermined value,
Power output monitoring means for outputting a first detection signal; Delay means for delaying the first detection signal by a predetermined time and outputting a second detection signal; Non-volatile memory means from which data can be freely read and written; A program for storing a program memory means; and a processing means for executing a program stored in the program memory means, which is driven by the power output and is initialized when a second detection signal is present, the processing means being driven by the power output and being initialized when the first detection signal is detected during execution of the program. When the first detection signal and the second detection signal disappear, the processing is interrupted and data indicating the processing state at that time is written into the non-volatile memory means, and when the first detection signal and the second detection signal disappear, the data indicating the processing state is written from the non-volatile memory means. A processing device having a non-volatile memory, comprising: electronic processing means for reading and re-executing said program based on said data. (2) The nonvolatile memory means has an auxiliary power source, a memory means that can freely read and write data, and that sets prohibition of reading and writing when the second detection signal is present; A processing device having a non-volatile memory according to claim 1, which is a battery backup memory means comprising: switching means for switching from the power supply output to an auxiliary power supply output to energize the memory means when the power supply output decreases.