Denon Dn-c620 - Dnc620 Professional Broadcast Cd Player, Service Manual

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75
Q709 : µPD78F9222
(1) Port functions
Pin Name I/O Function After Reset Alternate-
Function Pin
P20 to P23 I/O Port 2.
4-bit I/O port.
Can be set to input or output mode in 1-bit units.
An on-chip pull-up resistor can be connected by setting software. Input ANI0 to ANI3
P30 TI000/INTP0
P31
I/O Can be set to input or output mode in 1-
bit units.
An on-chip pull-up resistor can be
connected by setting software. Input
TI010/TO00/
INTP2
P34
Note
Input
Port 3
Input only Input RESET
Note
P40 −
P41 INTP3
P42 TOH1
P43 TxD6/INTP1
P44 RxD6
P45
I/O Port 4.
6-bit I/O port.
Can be set to input or output mode in 1-bit units.
An on-chip pull-up resistor can be connected by setting software.
Input
−
P121
Note
X1
Note
P122
Note
X2
Note
P123
I/O Port 12.
3-bit I/O port.
Can be set to input or output mode in 1-bit units.
An on-chip pull-up resistor can be connected only to P123 by
setting software.
Input
−
P130 Output Port 13.
1-bit output-only port
Output
−
Caution The P121/X1 and P122/X2 pins are pulled down during reset.