HD6432633 Datasheet, PDF (514/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

10B.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 10B-5.
Table 10B-5 Port 3 Pin Functions
Pin
P37/TxD4
P36/RxD4
P35/SCK1/
SCK4/IRQ5
Selection Method and Pin Functions
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.
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.
Switches as follows according to combinations of the SMR C/A bit of SCI1 or SCI4,
the SCR CKE0 and CKE1 bits, and the P35DDR bit.
SCK1 and SCK4 should not be set to output simultaneously.
CKE1 (SCI1)
0
CKE1 (SCI4)
0
0^*1
1^*1
1
1^*1
0^*1
1
C/A (SCI1)
0
C/A (SCI4)
0
1
—
—
—
1
CKE0 (SCI1)
0
CKE0 (SCI4)
0
0, 1, 1^*3
1, 0, 1^*3
—
—
—
—
P35DDR
0
1
—
—
—
—
0^*2
Pin function P35 input P35^*3 SCK1/SCK4^*3 SCK1/SCK4^*3
—
pin output pin output pin
output pin
—
SCK1/SCK4
input pin
IRQ5 input
Notes: *1 These settings are prohibited.
*2 If SCK1 and SCK4 are used as input (clock input) pins on the H8S/2695, P35DDR must be
cleared to 0.
*3 The output format is CMOS output. It becomes NMOS open drain output if P35ODR is set to 1.
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