HD64F3670 Datasheet, PDF (114/305 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

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
R/W
6−
0
−
5−
0
−
4 IRQ0
0
R/W
3−
1
−
2−
0
−
1 TXD
0
R/W
0−
0
−
Description
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.
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).
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.
Rev. 1.0, 03/01, page 90 of 280