HD64F3039F18 Datasheet, PDF (190/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 7 I/O Ports
Port 8 Data Register (P8DR)
P8DR is an 8-bit readable/writable register that stores data for pins P8₁ to P8₀.
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
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 1 and 0
These bits store data
for port 8 pins
When a bit in P8DDR is set to 1, if port 8 is read the value of the corresponding P8DR bit is
returned directly. When a bit in P8DDR is cleared to 0, if port 8 is read the corresponding pin level
is read.
Bits 7 to 2 are reserved. Bits 7 to 5 cannot be modified and always read 1. Bit 4, 3, and 2 can be
written and read, but it cannot be used for port input or output. If bit 4, 3, and 2 of P8DDR is read
while its value is 1, bit 4, 3 and 2 of P8DR is read directly. If bit 4, 3, and 2 of P8DDR is read
while its value is 0, it always reads 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. 26, 2007 Page 166 of 682
REJ09B0353-0300