MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 83

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

7.3 Port A
7.3.1 Port A Data Register (PORTA)
7.3.2 Data Direction Register A (DDRA)
MC68HC705P9 — Rev. 4.0
MOTOROLA
Port A is an 8-bit general-purpose I/O port.
The port A data register contains a latch for each of the eight port A pins.
PA[7:0] — Port A Data Bits
Data direction register A determines whether each port A pin is an input
or an output.
DDRA[7:0] — Data Direction Register A Bits
Reset:
Reset:
$0000
$0004
Read:
Read:
Write:
Write:
These read/write bits are software programmable. Data direction of
each port A pin is under the control of the corresponding bit in data
direction register A. Reset has no effect on port A data.
These read/write bits control port A data direction. Reset clears
DDRA[7:0], configuring all eight port A pins as inputs.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
DDRA7
Bit 7
Bit 7
PA7
0
Parallel Input/Output (I/O) Ports
Figure 7-3. Data Direction Register A (DDRA)
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Figure 7-2. Port A Data Register (PORTA)
DDRA6
PA6
6
6
0
DDRA5
PA5
5
5
0
Unaffected by reset
DDRA4
PA4
4
4
0
DDRA3
PA3
3
3
0
Parallel Input/Output (I/O) Ports
DDRA2
PA2
2
2
0
DDRA1
PA1
1
1
0
Technical Data
DDRA0
Bit 0
Bit 0
PA0
Port A
0
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