HD64F3670 Datasheet, PDF (116/323 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
R/W
1 TXD
0
R/W
0
0

Description
P17/,54/TRGV Pin Function Switch
This bit selects whether pin P17/,54/TRGV is used as
P17 or as ,54/TRGV.
0: General I/O port
1: ,54/TRGV input pin
Reserved
These bits are always read as 0.
P14/,54 Pin Function Switch
This bit selects whether pin P14/,54 is used as P14 or as
,54.
0: General I/O port
1: ,54 input pin
Reserved
This bit is always read as 1.
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: General I/O port
1: TXD output pin
Reserved
These bits are always read as 0.
Rev. 2.0, 03/02, page 92 of 298