SH7144 Datasheet, PDF (598/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

Bit
Bit Name Initial Value R/W
15 to 10 —
All 0
R
9
PB9DR 0
R/W
8
PB8DR 0
R/W
7
PB7DR 0
R/W
6
PB6DR 0
R/W
5
PB5DR 0
R/W
4
PB4DR 0
R/W
3
PB3DR 0
R/W
2
PB2DR 0
R/W
1
PB1DR 0
R/W
0
PB0DR 0
R/W
Description
Reserved
These bits are always read as 0s, and should only be
written with 0s.
See table 18.2
Table 18.2 Port B Data Register (PBDR) Read/Write Operations
Bits 9 to 0:
PBIOR
0
1
Pin Function
General input
Other than
general input
General output
Other than
general output
Read
Pin state
Pin state
PBDR value
PBDR value
Write
Can write to PBDR, but it has no effect on pin state
Can write to PBDR, but it has no effect on pin state
Value written is output from pin
Can write to PBDR, but it has no effect on pin state
Rev. 2.0, 09/02, page 558 of 732