![](http://datasheet.mmic.net.cn/380000/-PD78196Y_datasheet_16744919/-PD78196Y_48.png)
CHAPTER 3 PIN FUNCTIONS
48
(2)
Non-port pins
Pin Name
I/O
Function
After Reset
Alternate Function
INTP0
P30/TI81/CPT90
INTP1
P31/TO81
INTP2
P32/TO90
INTP3
Input
External interrupt input for which effective edges (rising
and/or falling edges) can be specified
Input
P33/TO82/BZO90
SI20
Input
Serial data input to serial interface
Input
P22/RxD20
SO20
Output
Serial data output from serial interface
Input
P21/TxD20
SCK20
I/O
Serial clock input/output for serial interface
Input
P20/ASCK20
ASCK20
Input
Serial clock input to asynchronous serial interface
Input
P20/SCK20
RxD20
Input
Serial data input to asynchronous serial interface
Input
P22/SI20
TxD20
Output
Serial data output from asynchronous serial interface
Input
P21/SO20
SCL0
I/O
SMB0 clock input/output
Input
P23
SDA0
I/O
SMB0 data input/output
Input
P24
SS20
Input
Chip select input to serial interface
Input
P25/TI80
TI80
Input
External count clock input to 8-bit timer (TM80)
Input
P25/SS20
TI81
Input
External count clock input to 8-bit timer (TM81)
Input
P30/INTP0/CPT90
TO80
Output
8-bit timer (TM80) output
Input
P26
TO81
Output
8-bit timer (TM81) output
Input
P31/INTP1
TO82
Output
8-bit timer (TM82) output
Input
P33/INTP3/BZO90
TO90
Output
16-bit timer (TM90) output
Input
P32/INTP2
CPT90
Input
Capture edge input
Input
P30/INTP0/TI81
BZO90
Output
Buzzer output
Input
P33/INTP3/TO82
ANI0 to ANI7
Input
A/D converter analog input
Input
P60 to P67
AV
REF
A/D converter reference voltage
AV
SS
A/D converter ground potential
AV
DD
A/D converter analog power supply
X1
Input
X2
Connected to crystal for main system clock oscillation
CL1
Input
CL2
Connect a resistor (R) and capacitor (C) for main system
clock oscillation
XT1
Input
XT2
Connected to crystal for subsystem clock oscillation
RESET
Input
System reset input
Input
V
DD0
Positive supply voltage for ports
V
DD1
Positive supply voltage for circuits other than ports
V
SS0
Port section ground potential
V
SS1
Ground potential of circuits other than ports
IC0
Internally connect this pin directly to the V
SS0
or V
SS1
pin.
IC2
Internally connect. Leave this pin open.
V
PP
This pin is used to set flash memory programming mode and
applies a high voltage when a program is written or verified.
In normal operation mode, connect this pin directly to the
V
SS0
or V
SS1
pin.