Main Control Board, Main Control CPU | Panasonic KX-P7100 specification

4.4.Main Control Board

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	to IC6 ( ASIC )
	H : Parallel I/F port, L : USB I/F port
b) Front Panel I/F
nRDYLED	sent to IC6 for driving READY LED on the front panel
nERRLED	sent to IC6 for driving ERROR LED on the front panel
nDRMLED	sent to IC6 for driving Process Unit LED on the front panel
nKEY	front panel key signal for detecting the Key on the front panel
c) Interrupt
nINTR	interrupt signal from IC3 ( ASIC )
nCAUTOFD	signal from host PC in case of Windows’ PnP request