mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 304

• Manufacturer Part Number: mc68hc908as60
• Description: Mc68hc908as60 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
20.3 Port A
20.3.1 Port A Data Register
20.3.2 Data Direction Register A
Technical Data
Address:
Address:
Port A is an 8-bit, general-purpose, bidirectional I/O port.
The port A data register (PTA) contains a data latch for each of the eight
port A pins.
PTA[7:0] — Port A Data Bits
Data direction register A (DDRA) determines whether each port A pin is
an input or an output. Writing a logic 1 to a DDRA bit enables the output
buffer for the corresponding port A pin; a logic 0 disables the output
buffer.
Reset:
Reset:
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
DDRA7
$0000
$0004
PTA7
Bit 7
Bit 7
Figure 20-3. Data Direction Register A (DDRA)
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Figure 20-2. Port A Data Register (PTA)
Input/Output (I/O) Ports
DDRA6
PTA6
6
6
DDRA5
PTA5
5
5
Unaffected by reset
DDRA4
Unaffected by reset
PTA4
4
4
DDRA3
PTA3
3
3
MC68HC908AS60 — Rev. 1.0
DDRA2
PTA2
2
2
DDRA1
PTA1
1
1
DDRA0
PTA0
Bit 0
Bit 0