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9.4.3
Pin Functions
The port 3 pins also function as SCI I/O input pins (TxD0, RxD0, SCK0, TxD1, RxD1, and
SCK1) and as external interrupt input pins (IRQ4 and IRQ5). The functions of port 3 pins are
shown in Table 9-7.
Table 9-7
Port 3 Pin Functions
Pin
Selection Method and Pin Functions
P37
Switches as follows according to the setting of the P37DDR bit.
P37DDR
Pin function
Note: * When P37ODR = 1, it becomes NMOS open drain output.
P36
Switches as follows according to the setting of the P36DDR bit.
P36DDR
Pin function
Note: * When P36ODR = 1, it becomes NMOS open drain output.
P35/SCK1/
Switches as follows according to the combinations of the C/A bit of SMR1, the
IRQ5
CKE0 and CKE1 bits of SCR, and the P35DDR bit.
CKE1
C/A
CKE0
P35DDR
Pin function
Note: * When P35ODR = 1, it becomes NMOS open drain output.
P34/RxD1
Switches as follows according to combinations of bit RE of SCR1 and bit P34DDR.
RE
P34DDR
Pin function
Note: * When P34ODR = 1, it becomes NMOS open drain tray.
0
P37 input pin
0
P36 input pin
0
0
0
1
P35
P35
input pin
output pin*
0
0
P34 input pin
P37 output pin*
P36 output pin*
0
1
—
—
—
SCK1
SCK1
output pin*
output pin*
IRQ5 input
1
P34 output pin*
1
1
1
1
—
—
—
SCK1
input pin
1
—
RxD1 input pin
245
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