MC68HC908JK1 Datasheet, PDF (149/210 Pages) Motorola, Inc – MC68HC908JK1

I/O Ports
Port A Data Register (PTA)
12.4 Port A Data Register (PTA)
The port A data register (PTA) contains a data latch for each of the seven
port A pins.
Address: $0000
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
Write:
PTA6 PTA5 PTA4 PTA3 PTA2 PTA1 PTA0
Reset:
Unaffected by Reset
Additional Functions:
LED
(Sink)
LED
(Sink)
LED
(Sink)
LED
(Sink)
LED
(Sink)
LED
(Sink)
30k pull-up 30k pull-up 30k pull-up 30k pull-up 30k pull-up 30k pull-up 30k pull-up
Keyboard Keyboard Keyboard Keyboard Keyboard Keyboard Keyboard
Interrupt Interrupt Interrupt Interrupt Interrupt Interrupt Interrupt
Figure 12-2. Port A Data Register (PTA)
PTA[6:0] — Port A Data Bits
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.
KBI[6:0] — Port A Keyboard Interrupts
The keyboard interrupt enable bits, KBIE6-KBIE0, in the keyboard
interrupt control register (KBAIER) enable the port A pins as external
interrupt pins, (see Section 14. Keyboard Interrupt Module (KBI)).
MC68H(R)C908JL3 — Rev. 1.0
MOTOROLA
I/O Ports
Technical Data
149