HD64F3642AHV Datasheet, PDF (218/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

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
Abbr.
R/W
PDR8
R/W
PCR8
W
Initial Value
H'00
H'00
Address
H'FFDB
H'FFEB
Port Data Register 8 (PDR8)
Bit
Initial value
Read/Write
7
P87
0
R/W
6
P86
0
R/W
5
P85
0
R/W
4
P84
0
R/W
3
P83
0
R/W
2
P82
0
R/W
1
P81
0
R/W
0
P80
0
R/W
PDR8 is an 8-bit register that stores data for port 8 pins P8₇ to P8₀. If port 8 is read while PCR8
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
Initial value
Read/Write
7
PCR87
0
W
6
PCR86
0
W
5
PCR85
0
W
4
PCR84
0
W
3
PCR83
0
W
2
PCR82
0
W
1
PCR81
0
W
0
PCR80
0
W
PCR8 is an 8-bit register for controlling whether each of the port 8 pins P8₇ to P8₀ functions as an
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