Port Mode Register 1(Pmr1) - Hitachi H8/3672 Series Hardware Manual

9.1.1

Port Mode Register 1(PMR1)

PMR1 switches the functions of pins in port 1 and port 2.
Bit Bit Name Initial Value R/W
7 IRQ3 0
−
6 0
−
5 0
4 IRQ0 0
−
3 1
−
2 0
1 TXD 0
−
0 0
Rev. 1.0, 03/01, page 90 of 280
Description
R/W P17/IRQ3/TRGV Pin Function Switch
This bit selects whether pin P17/IRQ3/TRGV is used as
P17 or as IRQ3/TRGV.
0: P17 I/O port
1: IRQ3/TRGV input pin
−
Reserved
−
These bits are always read as 0, and cannot be modified.
R/W P14/IRQ0 Pin Function Switch
This bit selects whether pin P14/IRQ0 is used as P14 or as
IRQ0.
0: P14 I/O port
1: IRQ0 input pin
−
Reserved
This bit is always read as 1 and cannnot be modified.
−
Reserved
This bit must always be cleared to 0 (setting to 1 is
disabled).
R/W P22/TXD Pin Function Switch
This bit selects whether pin P22/TXD is used as P22 or as
TXD.
0: P22 I/O port
1: TXD output pin
−
Reserved
These bits are always read as 0, and cannot be modified.