Register Configuration And Description - Renesas H8 Series Hardware Manual

Section 8 I/O Ports
8.8.2

Register Configuration and Description

Table 8.20 shows the port 8 register configuration.
Table 8.20 Port 8 Registers
Name
Port data register 8
Port control register 8
Port Data Register 8 (PDR8)
Bit
P8
Initial value
Read/Write R/W
PDR8 is an 8-bit register that stores data for port 8 pins P8
bits are set to 1, the values stored in PDR8 are read, regardless of the actual pin states. If port 8 is
read while PCR8 bits are cleared to 0, the pin states are read.
Upon reset, PDR8 is initialized to H'00.
Port Control Register 8 (PCR8)
Bit
PCR8
Initial value
Read/Write W
PCR8 is an 8-bit register for controlling whether each of the port 8 pins P8
input or output pin. Setting a PCR8 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin.
Upon reset, PCR8 is initialized to H'00.
PCR8 is a write-only register, which is always read as all 1s.
Rev. 6.00 Sep 12, 2006 page 196 of 526
REJ09B0326-0600
Abbr.
PDR8
PCR8
7 6 5
P8 P8
7 6
0 0 0
R/W R/W
7 6 5
PCR8 PCR8
7 6
0 0 0
W W
R/W Initial Value
R/W H'00
W H'00
4 3
P8 P8
5 4 3
0 0
R/W R/W
to P8
7
4 3
PCR8 PCR8
5 4
0 0
W W
Address
H'FFDB
H'FFEB
2 1
P8 P8
2 1
0 0
R/W R/W
. If port 8 is read while PCR8
0
2 1
PCR8 PCR8
3 2 1
0 0
W W
to P8 functions as an
7 0
0
P8
0
0
R/W
0
PCR8
0
0
W