| 摘要 |
An apparatus main body controlling section 2 and a memory access controlling section 3 transmit and receive data by means of serial data communication. The memory access controlling section 3 reads various information (the amount of remaining ink, use start year and month, and the like) stored in non-volatile memories 4 and 5 and stores the readout information in a RAM in the memory access controlling section 3. The apparatus main body controlling section 2 issues an access request command to the RAM to read out and renew the information. When a power supply to a printer is turned off, the apparatus main body controlling section 2 issues an information write back command. The memory access controlling section 3 writes the information in the RAM back to the non-volatile memories 4 and 5. Reads from and writes to the non-volatile memories 4 and 5 are thus executed via the memory access controlling section 3, thereby reducing the amount of processing to be executed by the apparatus main body controlling section 2 to access the non-volatile memories 4 and 5.
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