MC68HC705 MOTOROLA [Motorola, Inc], MC68HC705 Datasheet - Page 76

• Manufacturer Part Number: MC68HC705
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Parallel Input/Output (I/O)
7.3 Port A
7.3.1 Port A Data Register
Technical Data
76
Address:
Port A is an 8-bit, general-purpose, bidirectional input/output (I/O) port.
The port A data register (PORTA) shown in
latch for each of the eight port A pins. When a port A pin is programmed
to be an output, the state of its data register bit determines the state of
the output pin. When a port A pin is programmed to be an input, reading
the port A data register returns the logic state of the pin.
PA7–PA0 — Port A Data Bits
Reset:
Read:
Write:
These read/write bits are software programmable. Data direction of
each bit is under the control of the corresponding bit in data direction
register A. Reset has no effect on port A data.
$0000
Bit 7
PA7
Figure 7-1. Port A Data Register (PORTA)
Parallel Input/Output (I/O)
PA6
6
PA5
5
Unaffected by reset
PA4
4
PA3
3
Figure 7-1
MC68HC705C8A — Rev. 2.0
PA2
2
contains a data
PA1
1
MOTOROLA
Bit 0
PA0