3.3 Pin Functions - Renesas H8S/2633 Series Hardware Manual

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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

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 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.

Pin function

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

*3 The output format is CMOS output. It becomes NMOS open drain output if P35ODR is set to 1.

P37 input pin

P36 input pin

cleared to 0.

P37 output pin*

P36 output pin*

TxD4 output pin

RxD4 input pin