H838086R Datasheet, PDF (253/697 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Super Low Power Series

Section 9 I/O Ports
9.3.3 Port Mode Register 4 (PMR4)
PMR4 controls the selection of functions for port 4 pins.
Bit
7 to 3
Initial
Bit Name Value R/W

All 1 
2
TMOFH 0
R/W
1
TMOFL 0
R/W
0
TMIF
0
R/W
Description
Reserved
These bits are always read as 1 and cannot be modified.
P42/TXD31/IrTXD/TMOFH Pin Function Switch
Selects whether pin P42/TXD31/IrTXD/TMOFH is used
as P42 or TXD31/IrTXD, or as TMOFH.
0: P42 I/O pin or TXD31/IrTXD output pin
1: TMOFH output pin
P41/RXD31/IrRXD/TMOFL Pin Function Switch
Selects whether pin P41/RXD31/IrRXD/TMOFL is used
as P41 or RXD31/IrRXD, or as TMOFL.
0: P41 I/O pin or RXD31/IrRXD input pin
1: TMOFL output pin
P40/SCK31/TMIF Pin Function Switch
Selects whether pin P40/SCK31/TMIF is used as
P40/SCK31 or as TMIF.
0: P40/SCK31 I/O pin
1: TMIF input pin
Rev. 3.00 Aug 23, 2006 Page 175 of 616
REJ09B0182-0300