hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 275

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

8.10
8.10.1
Port A is a 4-bit I/O port, configured as shown in figure 8.9.
8.10.2
Table 8.26 shows the port A register configuration.
Table 8.26 Port A Registers
Name
Port data register A
Port control register A
Port Data Register A (PDRA)
PDRA is an 8-bit register that stores data for port A pins PA
PCRA bits are set to 1, the values stored in PDRA are read, regardless of the actual pin states. If
port A is read while PCRA bits are cleared to 0, the pin states are read.
Upon reset, PDRA is initialized to H'F0.
Bit
Initial value
Read/Write
Register Configuration and Description
Port A
Overview


7
1
Figure 8.9 Port A Pin Configuration


6
1
Port A


Abbr.
PDRA
PCRA
5
1


4
1
PA
PA
PA
PA
Rev. 7.00 Mar 10, 2005 page 233 of 652
R/W
R/W
W
R/W
3
2
1
0
PA
3
/COM
/COM
/COM
/COM
3
0
to PA
3
4
3
2
1
0
. If port A is read while
R/W
PA
Initial Value
H'F0
H'F0
2
0
2
Section 8 I/O Ports
R/W
REJ09B0042-0700
PA
1
0
1
Address
H'FFDD
H'FFED
R/W
PA
0
0
0