JPS5972550A - Presence or absence deciding system of program memory for option - Google Patents

Abstract

PURPOSE:To prevent a program runaway, by detecting that an option device is selectively connected to a main device and then detecting the head address of a program for option. CONSTITUTION:A controller 6 of a main device 1 is provided with an RAM9 connected to a CPU7 via a bus line 8, ROM10-12, an input/output interface I/O13, etc. The ROM10 is usually used; while ROM11 and 12 are for options. Input ports I0 and I1 of the I/O13 are pulled up by resistances R1 and R2 and set at L levels with connection of option devices 2, 14, etc. Then the CPU7 decides from the head address of ROM11 and 12 respectively whether the programs for option are connected to ROM11 and 12. The processing proceeds to the next stage in case a prescribed program is connected. This prevents the runaway of a program and is suitably applied to an original feed device of a copying machine.

Description

[Detailed Description of the Invention] This invention requires a permanent main program memory in which a program for controlling the main device is written, and an optional program memory in which a program for controlling optional devices that can be selectively connected to the main device is written. The present invention relates to a method for determining the presence/absence of an optional program memory in a control device that is expanded in accordance with the demand.

For example, some copiers have an automatic document feeder (ADF).
Some devices allow optional devices (peripheral devices) such as , semi-automatic document feeder (SADF), and sorter to be selectively connected at any time.

By the way, in such a copying machine, as shown in FIG.
When the ADF Z) 2 is connected via the connector 6.4 and the connection cable 5, the input capo 1-1o pulled up by the resistor R1 in the input/output interface 6a in the control device 6 of the copying machine 1 is connected to the ADF Z Since the ground circuit 2a on the side lowers the level to the low level It_OII, the control device 6 can determine whether or not the ADF 2 is connected to the copying machine 1 by checking the level of the input port 0.

When the control device 6 confirms that the ADF 2 is connected, it starts controlling the ADF 2 as well as the control related to the copying machine 1.

However, in the control device 6 of the copying machine 1, the main program memory (in which the copying machine control program is written)
-ROM) is permanently installed, but the ADF program memory (ROM) contains the ADF2 control program.
Since the controller 6 is designed to be added later as necessary, the following problem will occur if the control device 6 itself cannot determine the presence or absence of the ADF program memory.

That is, when the control device 6 enters program processing after only confirming that the ADF 2 is connected as described above, regardless of the presence or absence of the ADF program memory,
In order to execute that program, if you forget to add a program memory for the ADF, the control device 6
When I try to run the F program, it goes out of control.

The present invention has been made in view of the above points, and is an option program that allows a control device of the main device to determine the presence or absence of an option program memory when an option device is connected to a main device such as a copying machine. The purpose is to provide a method for determining the presence or absence of memory.

Hereinafter, embodiments of the present invention will be described with reference to FIG. 2 and subsequent drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention, and parts corresponding to those in FIG. 1 are given the same reference numerals.

In the figure, the control device 6 of the copying machine 1 is a central processing unit (
CPU) 7, a data memory (RAM) 9 connected to the CPU 7 via an address/data bus line 8 and a control path line (not shown), and first to third program memories (ROM) 10 to 12. and an input/output interface (Ilo) 13.

Then, the first tank 0M1-. 0 is the main program memory in which the copying machine control program is written, which is permanently installed in the control device 6, and the second i (,0M11 is the ADF
The third ROM 12 stores the control program for sorter 1.
This is an optional program memory in which each of the four control programs is written, and is added to each control device 6 as necessary.

In addition, the input ports Io and It of l1016 are 7'
Z is pulled up by resistors Rt and R2, and the input port 10 is A
The ground circuit 2a of DF2 drops to low level "0", and the input port ■1 is connected to the copier 1:2 connector 15.1.
6 and the connecting cable 17, the ground circuit 14a of the sorter 14 drops the low level II OII l1.

In addition, other input ports (not shown) of Ilo 13 include:
Signals from each loincloth sensor and operation input means in the copying machine 1 are input, and driver circuits for various drive units in the copying machine 1 are connected to the output port.

As shown in FIG. 3, the data path line 8a in the address/data path line 8 in the control device 6 is pulled up by the resistors R3 to R1o, and the data bus line 8a is pulled up by the resistors R3 to R1o. It is specified in FFH, which is the data content input to the CPU 7 of the control device 6 when it is in the open state.

FIG. 4 is a memory map diagram showing a group of addresses assigned to the first to third R, OM10=12.

As shown in the figure, the first ROM10 contains 0OOH to 3F.
The address of FH is 400 in the second R, 0M11.
The addresses of 800H-BP"FH are assigned to the third R and OM 12, respectively, and data such as 00000000" is written to the first address 400J (of the second ROM 11). and the start address 80 of the third R, OM 1 '2
For example, data "01111000" is written in 0H.

In addition, if CPU7 is Intel 8080 series, "0"
0000000” (OOH) is a NOP instruction, and “011
11000" (78n) is the N0VA, B instruction.

Next, while also referring to the flowchart in FIG.
The processing contents of the CPU 7 will now be explained.

It is assumed that the program shown in the flowchart of FIG. 5 is nested within the copying machine control program written in the first R, OM 10 of FIG.

First, 5TEf'l checks whether the level of the input port IO at l1013 in FIG.
'Proceed to EP3.

That is, if the ADF 2 is connected to the copying machine 1 as shown in FIG. First, proceed to s'rEp3 to proceed to 5TEP5, which executes the program for ADF2 of f'tOM11. Conversely, if ADF2 is not connected to copying machine 1, input capo) IO is pulled up by resistor R1. Since it is still in the high level health 1'1" state, in this case, do not proceed to S'l" EP 3 to 5, but directly to 5TEP 2.
Proceed to.

5TEP2 checks whether the level of the input port ■l in Ilo 13 is "1" as shown in FIG.
If n 1 n, proceed to the next step in the copying machine control program; if 0'', proceed to 8 T E P6.

That is, if the sorter 14 is connected to the copying machine 1 as shown in FIG. 3 R, OMl 2 Proceed first to 5TEP6 for executing the program for sorter 2. Conversely, if the sorter 14 is not connected to the copying machine 1, the input port ■l remains pulled up by the resistor R2. High level! 1", so in this case 5T
The program does not proceed to EP6-8, but proceeds to the next step in the copying machine control program of the first R, OM 10.

At 5TEP3, add ADF' 2 to copier 1 at 5TEPI.
Since it is checked that the ROM is connected, select only the second ROM11 (, OM11 in FIG. 2), specify the address as 400H, and select the second RO'M11.
Read the contents written at address 400H.

In this way, as shown in FIG.
1 is added, the second 1 (, OOH written in the start address 400H of OM 11 is
Also, if the second I (OMll) is not added, the data path line 8
A is in the oven state, but since the data path line 8a is pulled up by the resistors 3 to RIO as shown in FIG. The data F'l"H is sent to the CPU
7 is input.

Next, in 8TEP4, it is checked whether the contents input to the CPU7 in 5TEP3 are OO, H, and 00H is checked.
If so, proceed to 5TEP5, if not OOH, proceed to 5TEP
Proceed to step 2.

In other words, in this 5TEP4, CPU7 in 5TEP3
The contents entered in the second 1 (,0M11 address 4
The presence or absence of the second ROM 11 is determined by checking whether the contents match the contents of 00H. If they match, the second ROM 1111"> has been added, so proceed to 5TEP 5. After sequentially executing the program for ADF'2 written in the second ROM11 from the first address 400H, proceed to 9'TEP2, and if they do not match, the second R, 0M11 connects the ADF'2. Although it is installed, it has not been added, so it is directly 5
Proceed to TEP2.

Similarly, for s'rgp 6 to 8, address 800H
The presence or absence of the third R1,:JM12 is determined by comparing the contents input to the CPIJ7 by specifying the contents with the contents of the address 800H of the third) LOM 12, and the 30th) ROM 12 is added. If there is, the program for the sorter 14 written in the third ROM 12 is executed, and then the process advances to the next step; if it has not been expanded, the process directly advances to the next step.

By doing this, the second ROM1
1 or 3rd R, OM 12 is ADF 2 or sorter 14
Even if the CPU 7 is connected to the copying machine 1 but not added, the CPU 7 operates normally without running out of control.

In addition, in 5TEPI, 2 of FIG. 5, the input capo-to Io.

11 was set as ``1'''', but it may be set to 0'', and in 5TEP4.7, the judgment standard for input content was set as 00M or 78H, but of course it may be changed to pFH.

However, in this case, it is necessary to reverse the destination based on the determination result from that shown in FIG.

Furthermore, in FIG. 5, when it is determined that the ADH'2 or the sorter 14 is not added, the determination result may be displayed.

Furthermore, in the above embodiment, the second. 3rd)LOMit, 1
As the data used to determine the presence or absence of 2nd. Although an example has been described in which data at the starting address of the third ROM 11.12 is used, it goes without saying that data at any address may be used.

However, the second. In the data in the third ROM 11.12, if there is an address where the FFH (R8T7, which is one of the eight path start commands in the case of Intel 8080 series) is written, the data at that address will be used. Can not.

Furthermore, in the above embodiment, an example was described in which the data bus line was pulled up, but when the data bus line is pulled down and the data bus line is in the open state, the data contents input to the CPU 7 + 2 are specified as OOH. Also good.

In the above embodiment, the ADF 2 and the sorter 14 were used as examples of optional devices that can be connected to the copying machine 1, but other devices such as a semi-automatic document feeder (SADF), a collator, and a connector rack are also available. The same can be done for both cases.

Furthermore, the present invention is not limited to a control device for a copying machine, but can be applied to any control device that can selectively connect an optional device to the main device and can add optional program memory as necessary. But it can be applied as well.

As explained above, according to the present invention, when an optional device is connected to the main device, the control device of the main device can determine whether there is a program memory for the option. No more running out of control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram explaining a control device to which the present invention is applied; FIG. 2 is a block diagram showing an embodiment of the present invention; FIG. 6 is a data node diagram of the control device in FIG. Figure 4 is a memory map diagram of the first to third R and OM in Figure 2. Figure 5 is a diagram of a program executed by the CPU in Figure 2. 1. Copying machine (main device) 2. Automatic document feeder (ADF) [optional device) 6, 4.15.16. Carp lid 5.17.・・Connection cable 6・Control device 7・
...Central processing unit (CPU) 8...Address/data bus line 8a...Data bus line 10...First program memory (main program memory) 11...Second program memory (optional) 12...Third program memory (optional program memory) Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] 1 A control device in which a main program memory in which a program for controlling the main device is written is permanently installed, and an optional program memory in which a program for controlling optional devices that can be selectively connected to the main device is written is added as necessary. In this step, the data bus line of the control device is pulled-amplified or pulled down to specify the data content input to the control device when the data path line is in an open state, and the optional device is connected to the main device. specifying a predetermined address from among the address group allocated to the option program memory when
The presence or absence of the option program memory is determined by checking whether the data content input to the control device by specifying the predetermined address matches the data content at the predetermined address of the option program memory. How to determine the presence or absence of optional program memory.