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CHAPTER 2 PIN FUNCTIONS
21
(2) Non-port pins (1/2)
Pin Name
Input/Output
Alternate Function
Functions
TO0/TO3
Output
P34 to P37
Timer output
CI
Input
P23/INTP2
Count clock input to timer/counter 2
RxD
Input
P30/SI1
Serial data input (UART0)
RxD2
P13/SI2
Serial data input (UART2)
TxD
Output
P31/SO1
Serial data output (UART0)
TxD2
P14/SO2
Serial data output (UART2)
ASCK
Input
P25/INTP4/SCK1
Baud rate clock input (UART0)
ASCK2
P12/SCK2
Baud rate clock input (UART2)
SDA
Input/output
P33/SO0
Serial data input/output (2-wire serial I/O, I
2
C bus
Note
)
SI0
Input
P27
Serial data input (3-wire serial I/O0)
SI1
P30/RxD
Serial data input (3-wire serial I/O1)
SI2
P13/RxD2
Serial data input (3-wire serial I/O2)
SO0
Output
P33/SDA
Serial data output (3-wire serial I/O0)
SO1
P31/TxD
Serial data output (3-wire serial I/O1)
SO2
P14/TxD2
Serial data output (3-wire serial I/O2)
SCK0
Input/output
P32/SCL
Serial clock input/output (3-wire serial I/O0)
SCK1
P25/INTP4/ASCK
Serial clock input/output (3-wire serial I/O1)
SCK2
P12/ASCK2
Serial clock input/output (3-wire serial I/O2)
SCL
P32/SCK0
Serial clock input/output (2-wire serial I/O, I
2
C bus
Note
)
NMI
Input
P20
External interrupt requests
—
INTP0
P21
Count clock input to timer/counter 1
CR11 or CR12 capture trigger signal
INTP1
P22
Count clock input to timer/counter 2
CR22 capture trigger signal
INTP2
P23/CI
Count clock input to timer/counter 2
CR21 capture trigger signal
INTP3
P24
Count clock input to timer/counter 0
CR02 capture trigger signal
INTP4
P25/ASCK/SCK1
—
INTP5
P26
A/D converter conversion start trigger input
AD0 to AD7
Input/output
P40 to P47
Time division address/data bus (external memory connection)
A8 to A15
Output
P50 to P57
Upper address bus (external memory connection)
A16 to A19
Output
P60 to P63
Upper address with address extension (external memory connection)
RD
Output
P64
External memory read strobe
WR
Output
P65
External memory write strobe
WAIT
Input
P66/HLDRQ
Wait insertion
REFRQ
Output
P67/HLDAK
External pseudo-static memory refresh pulse output
HLDRQ
Input
P66/WAIT
Bus hold request input
HLDAK
Output
P67/REFRQ
Bus hold response output
Note
μ
PD784038Y Subseries only