Main Control Board - Panasonic KX-P7100 Service Manual

KX-P7100
4.4.

Main Control Board

4.4.1. Main Control CPU
This CPU is an 8-bit microcontroller which is compatible with the Intel 80C51.
It contains the two types of memory: ROM : 4k bytes, RAM : 128 bytes
The CPU controls the RIP block of this printer. The main functions are as follows :
1) Initialization and control of GDI ASIC
2) Control the interface ( USB/Parallel ) port
3) Windows PnP ( Plug & Play ) detection in Parallel
4) LED Control and Key Detection on the front panel
The CPU processes the print data from the host PC through the GDI ASIC ( IC3 ).
Peripheral I/F
a) USB/Parallel Select
1284SEL
b) Front Panel I/F
nRDYLED
nERRLED
nDRMLED
nKEY
c) Interrupt
nINTR
nCAUTOFD
to IC6 ( ASIC )
H : Parallel I/F port, L : USB I/F port
sent to IC6 for driving READY LED on the front panel
sent to IC6 for driving ERROR LED on the front panel
sent to IC6 for driving Process Unit LED on the front panel
front panel key signal for detecting the Key on the front panel
interrupt signal from IC3 ( ASIC )
signal from host PC in case of Windows' PnP request
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