JPS6222200B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cash register having a function of battery supporting a memory that stores control programs and the like.

[Problems to be solved by conventional technology and invention]

Conventionally, in POS (point of sales, point of sale terminal information device) used as accounting machines in self-service stores, etc., the program is
There is a format that is written and implemented in ROM (read-on memory). However, in this format, it is necessary to adapt to each user's POS specifications or each time there is a change in usage.
The disadvantage is that the ROM must be changed. Therefore, in order to cope with the increase in memory capacity due to the increase in POS device functions, avoid the use of expensive ROM, and cope with the diversity of specifications by users (i.e., programs are different depending on users), An IPL method (initial program load method) has been proposed in which the data is written into a volatile memory, such as a dynamic RAM (random access memory), at the start of processing, such as when the power is turned on. This system requires battery support after the power is turned off to prevent the memory contents of the RAM from disappearing due to power off (including instantaneous interruptions and power outages). However, dynamic RAM requires refreshing, requires multiple power supplies, for example, 3 power supplies of +12V and ±5V, and has a large load capacity.If battery support is provided, the battery will have a large capacity.
There are problems in that the manufacturing cost is high, and when battery support is performed, the battery is used indefinitely, resulting in damage to the battery and shortened lifespan due to overdischarge.

[Means and actions for solving problems]

In order to solve the above-mentioned problems, the present invention is based on the concept of providing battery support only to the minimum necessary level even after the power is turned off, and the present invention is based on the idea that the power is turned off after a certain operation is completed, that is, after a close operation is completed. The battery support is also separated to reduce battery wear and tear.
Reduce the battery capacity to reduce manufacturing costs, and when battery support is provided, monitor the battery voltage to prevent over-discharge, thereby preventing battery damage. The purpose is to extend the life of the battery.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block circuit diagram of a cash register as an embodiment of the present invention, and FIG. 2 is an operational flowchart for explaining the operation of the device shown in FIG.
In FIG. 1, the refresh circuit 11 is connected to the power supply 1.
Operates when 2 is on. TTL-IC (Transistor Transistor Logic Integrated Circuit) and CMOS-IC (complementary MOS
integrated circuit), TTL-IC and CMOS-
IC switching is performed by an internal switch (not shown) of the refresh circuit 11. That is, when the power supply 12 is turned on, the interface circuit 22 operates the internal switch to select the TTL-IC, and on the other hand, during battery support, the interface circuit 22 operates the internal switch.
Operate CMOS-IC. Also, dynamic
Multiple voltages required for RAM 14, e.g. V ₁ = +
12V, V ₂ =+5V and V ₃ =-5V are obtained by DC/DC converter 13 . First, power supply 12
When turned on, the DC/DC converter 13 converts the three voltages V ₁ , V ₂ and V ₃ to the dynamic RAM 1.
The interface circuit 22 operates the TTL-IC of the refresh circuit 11 in response to a signal from the discrimination circuit 21 which monitors the power supply 12, and thereby the dynamic RAM 14 is refreshed. At the same time, the output signal a of the interface circuit 22 becomes "1", while the output signal b becomes "0", and in this case, the off circuit 23
Since the other input signal c is "0", the RS flip-flop 24 is set, so that
The relay circuit 25 is driven, the relay contact 26 is closed, and the battery 31 is charged. In this case, the light emitting diode 27 indicates the operating status of the device. Next, the CPU 34 controls the T/C (terminal controller: not shown) as a center device.
Alternatively, a program is loaded into the dynamic RAM 14 from a cassette tape (not shown) or the like.
This IPL operation is performed by a program preset in a ROM (not shown). POS terminals used as sales accounting machines are usually located at multiple locations within a store. These POS
The terminal is called a T/C (terminal controller), and is connected via a private line to a higher-level parent machine equipped with a larger memory capacity and multiple functions. IPL
At times, data to be loaded into the dynamic RAM 14 is transmitted via the local circuit if from the T/C or via the internal bus if from the cassette tape. This puts the POS into a state where it performs normal operations, such as cash registration work. That is, the CPU 34 executes the program stored in the RAM 14, thereby enabling the operator to perform monetary registration work. and,
Registration information registered through operator operations will also be stored in this RAM 14. After these series of cash registration operations are completed and the settlement journal for one day's worth of cash registration operations is output by the CPU 34, that is, after the close operation is completed, the power supply 12 is turned off. Alternatively, the power supply 12
The power supply 12 may be turned off due to a failure or power outage. Furthermore, when an operator leaves his/her own post, that is, his or her own POS,
The power supply 12 may be turned off by key operation or the like. In either case, power is supplied from the battery 31 instead of the power supply 12, and battery support is started. In this case, the refresh circuit 11 is switched to the operating state of a CMOS-IC that consumes less power by a signal from the discrimination circuit 21 that monitors the power supply 12. Further, the determination circuit 21 determines whether or not the close operation has been completed by reading flag information at a predetermined address of the dynamic RAM 14. If it is determined that the close operation has been completed, the determination circuit 21 2
1, the interface circuit 22
The output signal a becomes "0", while the output signal b
becomes "1". Therefore, RS flip-flop 24 is reset, relay circuit 25 is stopped, relay contact 26 is opened, and battery support is disconnected. In this way, even if the power supply 12 is turned off, if the determination circuit 21 determines that the close operation has ended, the battery 31 will not supply power and the battery support will be disconnected. .

Next, consider the case in which the determination circuit 21 determines that the close operation has not yet finished. Examples of cases where the power supply 12 is turned off before the end of the close operation include operator error, power outage, and failure of the power supply unit. In such a case, the command signal from the discrimination circuit 21 causes the interface circuit 22 to
The output signals a and b of are "0", and the other input signals of the OR circuit 23 are also "0", so
RS flip-flop 24 remains set, which causes relay contact 26 to remain closed. Therefore, battery support will continue. While this battery support continues, the voltage of the battery 31 is monitored by the battery voltage detection circuit 32, and if the voltage falls below the reference level,
The output signal c of the battery voltage detection circuit 32 is “0”
The value changes from 1 to 1. As a result, the RS flip-flop 24 is reset to the relay contact 26.
is opened and the battery support is disconnected. Note that the operational amplifier 33 of the battery voltage detection circuit 32
The reference level voltage is obtained by resistor-dividing one of the output voltages of the DC/DC converter 13, for example, _V1 . In this way, the power supply 12 is turned off, and
If the close operation is not yet completed,
Battery support continues, but if the battery voltage falls below the reference level, battery support is also disconnected.

As described above, the determination circuit 21 determines three states, namely, the power-on state, the power-off state and the state after the close operation is completed, and the power-off state and the state before the close operation ends. Based on the state, the interface circuit 22 sends out two output signals a and b of "1,0", "0,1" and "0,0".

Note that in the above embodiment, the dynamic
Although a battery support device for RAM is shown, the present invention can also be applied to a battery support device for other memories, such as static RAM. However, in this case, the refresh circuit 11 becomes unnecessary.

〔Effect of the invention〕

According to the present invention, even after the power is turned off, if it is determined that the close operation has ended, battery support is not executed, thereby reducing battery consumption. Therefore, the capacity of the battery can be reduced and manufacturing costs can be reduced. In particular, POS
In this case, there is little need to retain the program stored in the memory upon completion of the payment process. In other words, there is no harm in destroying the contents of the memory at the end of the day's work. In other words, at a POS terminal, before starting work every morning,
The IPL of the control program is performed on each POS terminal, and the registration information for one day is processed on the same day, so the data becomes completely unnecessary the next day.
Therefore, it is more efficient to invalidate the contents of the memory by turning off the power after the payment process, as in the present invention.

In addition, in the above embodiment, if it is determined that the close operation is not yet completed, battery support is continued, but in this case,
By checking the battery voltage and stopping battery support when it is detected that the battery voltage has fallen below the reference level, over-discharge of the battery can be prevented, thereby preventing battery damage. In addition, the life of the battery can be extended, which is useful for solving the problems of the conventional type described above.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a cash register as an embodiment of the present invention, and FIG. 2 is an operational flowchart for explaining the operation of the device shown in FIG. (Explanation of symbols), 11: Refresh circuit, 1
2: Power supply, 13: DC/DC converter, 14: Dynamic RAM, 21: Discrimination circuit, 22: Interface circuit, 23: OR circuit, 24: RS
Flip-flop, 25: Relay circuit, 31: Battery, 32: Battery voltage detection circuit, 34:
CPU.

Claims (1)

[Scope of Claims] 1. A processing device, a volatile memory that stores a program for cash registration work executed by the processing device, a main power source for the processing device and the volatile memory, and a main power source for the processing device and the volatile memory. and a support power source that performs battery support for the volatile memory when the main power source is turned off, the cash register is configured to determine whether or not the main power source is turned off and whether or not the payment processing by the processing device is completed. Discrimination means for determining, switch means for stopping battery support of the volatile memory by the support power supply, and control means for controlling the switch means based on the output of the determination means. The cash register is characterized in that the control means stops battery support by the support power source when the main power source is turned off and payment processing is completed.