hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 182

• Manufacturer Part Number: hd66100
• Description: H8/3867 Series
• Manufacturer: Renesas Electronics Corporation.

8.9
8.9.1
Port A is a 4-bit I/O port, configured as shown in figure 8.8.
8.9.2
Table 8.23 shows the port A register configuration.
Table 8.23 Port A Registers
Name
Port data register A
Port control register A
1. 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
Port A
Overview
Register Configuration and Description
—
—
7
1
Figure 8.8 Port A Pin Configuration
—
—
6
1
Port A
—
—
Abbrev.
PDRA
PCRA
5
1
—
—
4
1
PA
PA
PA
PA
R/W
R/W
W
3
2
1
0
R/W
PA
/COM
/COM
/COM
/COM
3
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
R/W
PA
1
0
1
Address
H'FFDD
H'FFED
R/W
PA
0
0
0
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