HD6413007F20 Datasheet, PDF (309/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

8. I/O Ports
Port B Data Direction Register (PBDDR): PBDDR is an 8-bit write-only register that can select
input or output for each pin in port B. When pins are used for TPC output, the corresponding
PBDDR bits must also be set.
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
PB₇ DDR PB₆ DDR PB₅ DDR PB₄ DDR PB₃ DDR PB₂ DDR PB₁ DDR PB₀ DDR
0
0
0
0
0
0
0
0
W
W
W
W
W
W
W
W
Port B data direction 7 to 0
These bits select input or output for port B pins
When a pin in port B becomes an output port if the corresponding PBDDR bit is set to 1, and an
input port if this bit is cleared to 0.
PBDDR is a write-only register. Its value cannot be read. All bits return 1 when read.
PBDDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. When transition is made to software standby mode while a PBDDR
bit is set to 1, the corresponding pin maintains its output state.
Port B Data Register (PBDR): PBDR is an 8-bit readable/writable register that stores output data
for pins port B. When port B functions as an output port, the value of this register is output. When
a bit in PBDDR is set to 1, if port B is read the value of the corresponding PBDR bit is returned.
When a bit in PBDDR is cleared to 0, if port B is read the corresponding pin level is read.
Bit
Initial value
Read/Write
7
PB ₇
0
R/W
6
PB ₆
0
R/W
5
PB ₅
0
R/W
4
PB ₄
0
R/W
3
PB ₃
0
R/W
2
PB ₂
0
R/W
1
PB ₁
0
R/W
0
PB ₀
0
R/W
Port B data 7 to 0
These bits store data for port B pins
PBDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Rev.5.00 Sep. 12, 2007 Page 279 of 764
REJ09B0396-0500