HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 684

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

18. I/O Ports
18.2.2
The port B data register (PBDR) is a 16-bit readable/writable register that stores port B data. Bits
PB9DR to PB0DR correspond to pins PB9 to PB0 (multiplexed functions omitted here).
When a pin functions is a general output, if a value is written to PBDR, that value is output
directly from the pin, and if PBDR is read, the register value is returned directly regardless of the
pin state.
When a pin functions is a general input, if PBDR is read, the pin state, not the register value, is
returned directly. If a value is written to PBDR, although that value is written into PBDR, it does
not affect the pin state. Table 18.2 summarizes port B data register read/write operations.
Rev.4.00 Mar. 27, 2008 Page 640 of 882
REJ09B0108-0400
Bit
15 to
10
9
8
7
6
5
4
3
2
1
0
Bit Name Initial Value
—
PB9DR
PB8DR
PB7DR
PB6DR
PB5DR
PB4DR
PB3DR
PB2DR
PB1DR
PB0DR
Port B Data Register (PBDR)
All 0
0
0
0
0
0
0
0
0
0
0
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
See table 18.2