KX-FP207RU, KX-FP218RU - Panasonic Fax Service Manual (repair manual). Page 17

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This custom IC is used for the general FAX operations.

1. CPU:

This model uses a Z80 equivalent to the CPU operating
at 12 MHz. Most of the peripheral functions are performed
by custom-designed LSIs. Therefore, the CPU only works
for processing the results.

2. RTC:

Real Time Clock

3. DECODER:

Decodes the address.

4. ROM/RAM I/F:

Controls the SELECT signal of ROM or RAM and the
bank switching.

5. CIS I/F:

Controls the document reading.

6. IMAGE DATA RAM:

This memory is programmed into the ASIC and uses 8
KB for the image processing. (See Fig. A.*)

7. THERMAL HEAD I/F:

Transmits the recorded data to the thermal head.

8. MOTOR I/F:

Controls the transmission motor which feeds the docu-
ment.
Controls the receiving motor which feeds the recording
paper.

9. OPERATION PANEL I/F:

Serial interface with Operation Panel.

10. I/O PORT:

I/O Port Interface.

11. ANALOGUE UNIT:

Electronic volume for the monitor.
Sends beep tones, etc.

Fig. A

This memory is incorporated into the ASIC (IC501) and used for the image processing.
Fig. A shows the memory map of the Image Data RAM.