| 摘要 |
<p>PURPOSE:To ensure the initial setting by resetting unstable information of a memory to initial set information at all times when the memory is mounted to the device and also at application of power in the transmitter where the memory unit is taken out or put in while the power is kept applied. CONSTITUTION:The memory unit consists of a power supply voltage detecting circuit 1 and a self-running counter 2 or the like and when the unit is mounted to the transmitter, a power voltage is applied to the said voltage detecting circuit 1 from a terminal A and detected. The detection signal sets an FF12, starts a self-running counter 2, which controls a selection circuit 4 and an output of an ROM5 is transmitted to an RAM3. Moreover, the initial set information written in the RAM3 is stored in advance in the ROM5. The content of the ROM5 is read by an address commanded by an address counter 6 and wirtten in the RAM3 by the said address. When the write is finished, the self-running counter 2 is stopped to reset the FF12 and the selection circuit 4 transmits the data to be processed from a terminal B to the RAM3.</p> |
