Control Section - Panasonic KX-F900 Service Manual

3. CONTROL SECTION
1Q ASIC (IC1)
This custom IC is used for g_n_ral PAX operatior_
(1) CPU: The KX-F900 uses a i_U equivalent CHU operating at 12MHz.
(2) RTC:
(3) DECODER:
(4) ROM/RAM I/F:
(5) CCD I/F:
(6) IMAGE DATA RAM:
(7) THERMAL HEAD I/F:
(8) TX MOTOR I/F:
(9) RX MOTOR I/F:
(10) OPERATION PANEL I/F:
(11) I/O PORT:
Many of the peripheral functions are handled by custom designed LSI.
As a result, the CPU only needs to process the result.
Real time clock.
Decodes the address.
Controls the SELECT signal of ROM or RAM and bank switching.
Controls document reading.
Inside ASIC and 8KB which is used by image processing.
Transmits the recorded data to the thermal head.
Controls the transmission motor which feeds the document.
Controls the receiving motor which feeds the reading document.
Serial interface with Operation Panel.
I/O Port Interface (Exa. Sensor etc.)
ROM (IC2)
This 128 KB ROM (EPROM or MASKROM) has 32 KB of common area and bank area (BK4-BK15).
The capacity of each bank is 8 KB.
The addresses of the common area are from 0000H to 7FFFH, and addressed from 8000H to 9FFFH are for the bank
area.
@ RAM (IC3)
This 32 KB RAM has 8 KB of common area and bank area (BK0, BK1 ).
The capacity of each bank is 12 KB.
The addresses of the common area are from D000H to EFFFH, and the addresses from A000H to CFFFH are for the
bank area.
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