HD6432646 Hitachi, HD6432646 Datasheet - Page 279

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

9.4.3
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
Pin
P37
P36
P35/SCK1/
IRQ5
P34/RxD1
Pin Functions
Port 3 Pin Functions
Selection Method and Pin Functions
Switches as follows according to the setting of the P37DDR bit.
Note: * When P37ODR = 1, it becomes NMOS open drain output.
Switches as follows according to the setting of the P36DDR bit.
Note: * When P36ODR = 1, it becomes NMOS open drain output.
Switches as follows according to the combinations of the C/A bit of SMR1, the
CKE0 and CKE1 bits of SCR, and the P35DDR bit.
Note: * When P35ODR = 1, it becomes NMOS open drain output.
Switches as follows according to combinations of bit RE of SCR1 and bit P34DDR.
Note: * When P34ODR = 1, it becomes NMOS open drain tray.
P37DDR
Pin function
P36DDR
Pin function
CKE1
C/A
CKE0
P35DDR
Pin function
RE
P34DDR
Pin function
input pin
P35
P34 input pin
0
P37 input pin
P36 input pin
0
0
output pin*
0
0
P35
0
1
0
P34 output pin*
0
IRQ5 input
output pin*
SCK1
—
1
1
output pin*
P37 output pin*
P36 output pin*
SCK1
—
—
1
RxD1 input pin
1
1
—
1
input pin
SCK1
—
—
—
1
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