MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 316
MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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Input/Output (I/O) Ports
17.3 Port A
17.3.1 Port A Data Register (PTA)
17.3.2 Data Direction Register A (DDRA)
Technical Data
316
Address:
Address:
Port A is an 8-bit general-purpose bidirectional I/O port.
The port A data register contains a data latch for each of the eight port
A pins.
PTA[7:0] — Port A Data Bits
Data direction register A 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:
Write:
Read:
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 17-2. Port A Data Register (PTA)
0
Figure 17-3. Data Direction Register A (DDRA)
Go to: www.freescale.com
Input/Output (I/O) Ports
DDRA6
PTA6
6
6
0
DDRA5
PTA5
5
5
0
Unaffected by Reset
DDRA4
PTA4
4
4
0
DDRA3
PTA3
3
3
0
MC68HC908AB32
DDRA2
PTA2
2
2
0
DDRA1
PTA1
1
1
0
MOTOROLA
—
Rev. 1.0
DDRA0
PTA0
Bit 0
Bit 0
0
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