HD6473032F16 Datasheet, PDF (304/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 9 I/O Ports
• Mode 7 (Single-Chip Mode)
Port 8 is a generic input/output port. A pin in port 8 becomes an output port if the
corresponding P8DDR bit is set to 1, and an input port if this bit is cleared to 0.
P8DDR is a write-only register. Its value cannot be read. All bits return 1 when read.
P8DDR is initialized to H'E0 or H'F0 by a reset and in hardware standby mode. The reset value
depends on the operating mode. In software standby mode P8DDR retains its previous setting. If a
P8DDR bit is set to 1, the corresponding pin maintains its output state in software standby mode.
Port 8 Data Register (P8DR)
P8DR is an 8-bit readable/writable register that stores output data for pins P8₄ to P8₀. When a bit
in P8DDR is set to 1, if port 8 is read the value of the corresponding P8DR bit is returned. When a
bit in P8DDR is cleared to 0, if port 8 is read the corresponding pin level is read.
Bit
7
6
5
4
3
2
1
0
—
—
—
P8 ₄
P8 ₃
P8 ₂
P8 ₁
P8 ₀
Initial value
1
1
1
0
0
0
0
0
Read/Write
—
—
—
R/W
R/W
R/W
R/W R/W
Reserved bits
Port 8 data 4 to 0
These bits store data
for port 8 pins
Bits 7 to 5 are reserved. They cannot be modified and always are read as 1.
P8DR is initialized to H'E0 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Rev. 3.00 Mar 21, 2006 page 274 of 814
REJ09B0302-0300