3.3 Pin Functions - Renesas H8S/2633 Series Hardware Manual

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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

Selection Method and Pin Functions

Switches as follows according to combinations of SCR TE bit of SCI4 and the

Pin function

Note: * When P37ODR = 1, it becomes NMOS open drain output.

Switches as follows according to combinations of SCR RE bit of SCI4 and the

Pin function

Note: * When P36ODR = 1, it becomes NMOS open drain output.

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.

Pin function

Notes: *1 Output type is NMOS push-pull. When P35ODR = 1, it becomes NMOS open

P37 input pin

P36 input pin

output pin *

drain output.

*2 SCK1 and SCK4 must not be output simultaneously.

P37 output pin*

P36 output pin*

output pin *

TxD4 output pin

RxD4 input pin