M68HC11K Datasheet, PDF (138/290 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Parallel Input/Output
6.3 Port A
Port A provides the I/O lines for the timer functions and pulse
accumulator. The eight port A bits (PA[7:0]) are configured as
high-impedance general-purpose inputs out of reset. Writes to DDRA
can change any of the bits to outputs. Writes to timer registers enable
the various timer functions (see Section 9. Timing System).
Address: $0000
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Undefined after reset
Alternate Pin Function: PAI
OC2
OC3
OC4 IC4/OC5 IC1
IC2
IC3
And/or: OC1
OC1
OC1
OC1
OC1
—
—
—
Figure 6-1. Port A Data Register (PORTA)
Address: $0001
Bit 7
6
5
4
3
2
1
Read:
DDA7
Write:
DDA6
DDA5
DDA4
DDA3
DDA2
DDA1
Reset: 0
0
0
0
0
0
0
Figure 6-2. Port A Data Direction Register (DDRA)
Bit 0
DDA0
0
DDA[7:0] — Data Direction for Port A Bits
0 = Input
1 = Output
Technical Data
138
Parallel Input/Output
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M68HC11K Family
MOTOROLA