MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 286

• Manufacturer Part Number: MC68HC708XL36
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

I/O Ports
Port A
Port A Data
Register
Data Direction
Register A
MC68HC708XL36
286
Address: $0000
Address: $0004
Port A is an 8-bit, general-purpose bidirectional I/O port.
PORTA contains the data latches for 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. 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
Bit 7
Bit 7
PA7
0
Figure 3. Data Direction Register A (DDRA)
Go to: www.freescale.com
Figure 2. Port A Data Register (PORTA)
DDRA6
PA6
6
6
0
I/O Ports
DDRA5
PA5
5
5
0
Unaffected by Reset
DDRA4
PA4
4
4
0
DDRA3
PA3
3
3
0
DDRA2
PA2
2
2
0
DDRA1
PA1
1
1
0
MOTOROLA
DDRA0
4-ports_a
Bit 0
Bit 0
PA0
0