Panasonic KX-FM330GR Service Manual page 183

6.3.3. ASIC (IC501)
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. CCD I/F:
Controls the document reading.
Note*:
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.
6. IMAGE DATA RAM:
This memory is programmed into the ASIC and uses 12 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 document.
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. RS232C I/F:
Serial interface with PC (KX-FM330 only)
Fig. A
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KX-FP320G / KX-FM330G