h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 267

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Port 8 Data Direction Register (P8DDR)
P8DDR is a 7-bit write-only register, the individual bits of which specify input or output for the
pins of port 8. P8DDR has the same address as PBPIN, and if read, the port B state will be
returned.
Setting a P8DDR bit to 1 makes the corresponding port 8 pin an output pin, while clearing the bit
to 0 makes the pin an input pin.
P8DDR is initialized to H'80 by a reset and in hardware standby mode. It retains its prior state in
software standby mode.
Port 8 Data Register (P8DR)
P8DR is a 7-bit readable/writable register that stores output data for the port 8 pins (P86 to P80). If
a port 8 read is performed while P8DDR bits are set to 1, the P8DR values are read directly,
regardless of the actual pin states. If a port 8 read is performed while P8DDR bits are cleared to 0,
the pin states are read.
P8DR is initialized to H'80 by a reset and in hardware standby mode. It retains its prior state in
software standby mode.
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
—
—
—
—
7
1
7
1
P86DDR P85DDR P84DDR P83DDR P82DDR P81DDR P80DDR
P86DR
R/W
W
6
0
6
0
P85DR
R/W
W
5
0
5
0
P84DR
R/W
W
4
0
4
0
Rev. 3.00 Jan 18, 2006 page 239 of 1044
P83DR
R/W
W
3
0
3
0
P82DR
R/W
W
2
0
2
0
Section 8 I/O Ports
REJ09B0280-0300
P81DR
R/W
W
1
0
1
0
P80DR
R/W
W
0
0
0
0