HD6433935 Hitachi, HD6433935 Datasheet - Page 185
HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
(521 pages)
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8.11
8.11.1
Port A is a 4-bit I/O port, configured as shown in figure 8-10.
8.11.2
Table 8-29 shows the port A register configuration.
Table 8-29 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 8-10 Port A Pin Configuration
—
—
6
1
Abbrev.
PDRA
PCRA
Port A
—
—
5
1
R/W
R/W
W
—
—
4
1
R/W
PA
PA
PA
PA
PA
3
3
0
to PA
3
2
1
0
3
Initial Value
H'F0
H'F0
0
. If port A is read while
R/W
PA
2
0
2
R/W
PA
1
0
Address
H'FFDD
H'FFED
1
R/W
PA
0
0
0
173
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