JPS607383A - Time counter - Google Patents

Abstract

PURPOSE:To achieve a smaller size and a higher reliability of the equipment with a reduction in the amount of IC elements by restraining the time-sharing use of a time counter. CONSTITUTION:According to a signal inputted into a time counting control section 2 from a frequency dividing section 10, the control section 2 inputs time counting data into a memory data register 3. The data in the register 3 is writtened into a counter 6 which executes a computation for counting time. After the computation, the data in the counter 6 is written into the register 3 and then, into a memory 4 after the passage of the writing time. While a time counting is executed for all of the time counting data in the memory 4, the control section 2 makes instructions from a microcomputer system 12 to stand by. A battery 11 supplies a power to parts composing a time counting circuit free from power failure.

Description

[Detailed Description of the Invention] (1) Description of the technical field to which the invention pertains The present invention relates to a timekeeping device, and in particular, to realizing N timekeeping circuits connected to a microcomputer system with one uninterruptible counter. Relating to a timekeeping device.

(,2) Description of Prior Art Conventionally, in a clock circuit connected to a microcomputer system, N clock circuits were realized using N counters, so a large number of counters were required.
There were drawbacks (■ to ■) shown below.

(2) It requires a large number of IC elements.

(2) Due to the above (2), it is difficult to miniaturize the device.

(2) Due to the above (2), the cost will be high.

(2) Due to the above (2), reliability is reduced and stability is lacking.

(3) Detailed description of the invention The present invention has been made in view of the above-mentioned conventional circumstances,
Therefore, an object of the present invention is to provide a new timekeeping device that can overcome the above-mentioned drawbacks of the conventional technology.

(i) Structure of the Invention In order to achieve the above object, a timekeeping device according to the present invention comprises N
It is configured with one timekeeping counter function that realizes two timekeeping circuits, a timekeeping control function that controls time-sharing use of the counter, and a battery function that provides uninterrupted power supply. Conventionally, ejN counters were used to implement N timekeeping devices, but now a single uninterruptible counter can now measure N times. .

(5) Detailed Description of the Invention Next, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

Figure 7 is a block diagram showing an embodiment of the present invention. In the figure, the reference number / is an interface control unit that controls the interface with the microcomputer system, ko is a clock control unit, J is a memory data register, Hiroshi is a memory, ! is the memory address register, 6 is the counter,
1 is a detection circuit for detecting zero value of time data, g is a timeout register, wa is a clock oscillator, io is a frequency divider, l/ is a batch+), and is is a microcomputer system.

When this clock circuit is initialized, the contents of the memory register, that is, the values of the clock data all become zero. After initialization, the timekeeping control unit executes timekeeping, receives data for timekeeping, and transmits data for timekeeping. Further, when a timeout occurs as a result of the time measurement, a signal indicating the timeout is transferred to the timeout register and the microcomputer system 7.2 through the interface control unit. Execution of time measurement, transfer of time measurement data, and transfer of a signal indicating timeout are performed by the time control section between the reference period signal sent from the frequency divider 10 to the time control section and the next reference period signal. executed. Details of time measurement execution and transfer of time measurement data and timeout signal are shown below.

Writing of clock data into the memo IJp is performed by the following operation. Microcomputer system/
The command from 2 is received by the time control section λ via line /3, interface section l, and line/da. This command is f%'F;lJi by the clock control unit, and if it is a write command, the clock control unit 1111, 7V''1, instruction 1.
Address information indicating the address of the memory register contained in the memory address register S---- is read through the line /S, and the timeout register of the address indicated by the address information is reset through the line 2.2.

Further, the time control unit analyzes the instruction and writes the time measurement data included in the instruction to the memory data register 3 through the gland/7. Writing to the memory 1 is executed by holding the memory data register 3 and the memory address register S for the time required for writing to the memory.

Execution of time measurement is performed by the following operations.

A signal input from the minute period 10 through lines and 2 to the timekeeping control unit Y every reference period triggers the timekeeping control unit KO, and the execution of timekeeping begins. The clock control unit writes an address to the memory address register S through the line /3, and after the time required for reading the memory has elapsed, the clock data is input to the memory data register 3 through the line /3.

Further, the data in the memory data register 3 is transferred to the counter 6 through the input/A, and the counter base performs arithmetic operations for measuring time. If the time measurement data is zero, the zero detection circuit 7 inputs a signal to the counter 6 through the gland 2/ to prevent the time measurement calculation from being performed, and the time measurement calculation is not performed.

After executing the time calculation, if the data in the counter 6 becomes zero, that is, a timeout occurs, the timeout register g
is set through line 20. ) Sen:! After ``1 degree'', the data in the counter 6 is written to the memory data register 3 through the line /7, and then written to the memory p after the elapse of the blue write time. Execute on all the timing data in the file.

The operation in which the microcomputer system/co reads out the clock data being memorized is performed as follows. Instructions from the microcomputer system are sent to the gland/3
, interface control section, and 1t91 to the timekeeping control section. The timing control unit analyzes this instruction, and if it is a read instruction, the timing control unit stores the address indicated in the instruction in the memory address registers VC, tQ.
After the time required to read the memory register 3, the contents of the memory indicated by the address are written to the memory data register 3 through a line/wire. Next, the memory data register 3 is read out to the time control unit through wire /6 and transferred to the microcomputer system through line /ll, interface control unit', and line i3.

The writing of clock data to the memory has a higher priority than the transfer of clock data between the memory l and the microcomputer system 72.

The operations explained above can be summarized as follows.

In response to the signal input from the frequency divider 10 to the time control unit through the two wires, the time control unit starts counting the time data and executes time measurement for all the time data in the memo IJ9. . While the time is being measured for all the time data in the memory, the time control unit will not respond even if commands are input from the microcomputer system/:1.
You will have to wait until the timer finishes counting. When the time measurement ends, if a command has arrived from the microcomputer system/2, it is executed; if no command has come, it waits for the next signal from the frequency divider 10.

The battery // supplies power to each part of the timekeeping circuit f:m without interruption.

The present invention has been described above with respect to one preferred embodiment thereof, but
It is merely an example, and the present invention is not limited to the embodiments described herein.
It goes without saying that it includes all modifications and changes within its scope.

(6) Detailed Description of the Invention As explained above, the present invention provides a timekeeping device connected to a microcomputer system that includes one timekeeping counter that realizes N timekeeping circuits, and a clock counter for the counter. It is composed of a timekeeping control unit that controls divided usage and a battery that supplies power uninterruptedly, and the following effects can be achieved by measuring N times with each uninterruptible counter.

(2) The amount of unprocessed elements can be reduced.

(2) Due to the above, the device can be made smaller.

(2) The above-mentioned costs can be reduced.

■The reliability increases due to the above.

[Brief explanation of the drawing]

FIG. 7 is a block diagram showing an embodiment of a timekeeping device according to the present invention. /...interface section, λ...timekeeping control section, 3.
...Memory data register, da...memory, j...
Memory address register, 6... Counter, ri...
Zero detection circuit, g...timeout register, r...
Clock oscillator, 10... Frequency divider, /I... Battery, /S... Microcomputer system, 73
~． 21I... Patent applicant Representative of NEC Corporation Patent attorney Yutabe Kumagai

Claims (1)

[Claims] In a timekeeping device connected to a microcomputer system, there is one timekeeping counter unit that realizes multiple timekeeping circuits, a timekeeping control unit that controls time-sharing use of the timekeeping counter unit, and an uninterrupted What is claimed is: 1. A timekeeping device comprising a battery section for supplying power, and measuring a plurality of times using one uninterruptible counter.