h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 240

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 I/O Ports
9.8
Port B is an 8-bit I/O port. Port B also functions as LCD driver output pins and as address bus
outputs. The pin functions are determined by the operating mode.
Port B has a built-in MOS input pull-up function that can be controlled by software.
• Port B data direction register (PBDDR)
• Port B data register (PBDR)
• Port B register (PORTB)
• Port B pull-up MOS control register (PBPCR)
• Port B open-drain control register (PBODR)
9.8.1
PBDDR is a write-only register, the individual bits of which specify input or output for the pins of
port B. PBDDR cannot be read; if it is, an undefined value will be read.
Rev. 2.00 Dec. 05, 2005 Page 202 of 724
REJ09B0200-0200
Bit
7
6
5
4
3
2
1
0
Port B
Port B Data Direction Register (PBDDR)
Bit Name
PB7DDR
PB6DDR
PB5DDR
PB4DDR
PB3DDR
PB2DDR
PB1DDR
PB0DDR
Initial
Value
0
0
0
0
0
0
0
0
R/W
W
W
W
W
W
W
W
W
Description
Setting a PBDDR bit to 1 makes the corresponding
port B pin an output pin, while clearing the bit to 0
makes the pin an input pin.