HD6432633 Datasheet, PDF (438/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

10A.3.3 Pin Functions
The port 3 pins double as SCI I/O input pins (TxD0, RxD0, SCK0, TxD1, RxD1, and SCK1). The
functions of port 3 pins are shown in table 10A-5.
Table 10A-5 Port 3 Pin Functions
Pin
Selection Method and Pin Functions
P37/TxD4
Switches as follows according to combinations of SCR TE bit of SCI4 and the
P37DDR bit.
TE
0
1
P37DDR
0
1
—
Pin function
P37 input pin
P37 output pin*
TxD4 output pin
Note: * When P37ODR = 1, it becomes NMOS open drain output.
P36/RxD4
Switches as follows according to combinations of SCR RE bit of SCI4 and the
P36DDR bit.
RE
0
1
P36DDR
0
1
—
Pin function
P36 input pin
P36 output pin*
RxD4 input pin
Note: * When P36ODR = 1, it becomes NMOS open drain output.
P35/SCK1/
SCK4/SCL0/
IRQ5
Switches as follows according to combinations of ICCR0 ICE bit of IIC0, SMR C/A
bit of SCI1 or SCI4, SCR CKE0 and CKE1 bits, and the P35DDR bit.
When used as a SCL0 I/O pin, always be sure to clear the following bits to 0: SMR
C/A bits of SCI1 or SCI4, and SCR CKE0 and CKE1 bits. Do not set SCK1 and
SCK4 to simultaneous output.
The SCL0 output format is NMOS open drain output, enabling direct bus driving.
ICE
0
1
CKE1 (SCI1)
0
CKE1 (SCI4)
0
0, 1, 1
0
1, 0, 1
0
C/A (SCI1)
0
C/A (SCI4)
0
1
1
—
0
0
CKE0 (SCI1)
CKE0 (SCI4)
0
0
0, 1, 1*²
1, 0, 1*²
—
—
0
0
P35DD
0
1
—
—
—
—
Pin function
P35
P35 SCK1/SCK4 SCK1/SCK4 SCK1/SCK4 SCL0
input pin output pin*¹ output pin*¹ output pin*¹ input pin I/O pin
IRQ5 input
Notes: *1 Output type is NMOS push-pull. When P35ODR = 1, it becomes NMOS open
drain output.
*2 SCK1 and SCK4 must not be output simultaneously.
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