mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 380

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
18.3 Port A
18.3.1 Port A Data Register (PTA)
Data Sheet
380
Alternative Function:
Address:
Port A is an 8-bit special function port that shares four of its port pins with
the analog-to-digital converter (ADC) module and four of its port pins
with the keyboard interrupt module (KBI).
The port A data register contains a data latch for each of the eight port A
pins.
PTA[7:0] — Port A Data Bits
KBI[3:0] — Keyboard Interrupt Channels 3 to 0
Reset:
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.
KBI[3:0] are pins used for the keyboard interrupt input. The
corresponding input, KBI[3:0], can be enabled in the keyboard
interrupt enable register, KBIER. Port pins used as KBI input will
override any control from the port I/O logic. See
Keyboard Interrupt Module
$0000
ADC3
PTA7
Bit 7
Figure 18-2. Port A Data Register (PTA)
Input/Output (I/O) Ports
ADC2
PTA6
6
PTA5
ADC1
5
Unaffected by Reset
(KBI).
ADC0
PTA4
4
PTA3
KBI3
MC68HC908LJ24/LK24 — Rev. 2.1
3
PTA2
KBI2
Freescale Semiconductor
2
Section 20.
PTA1
KBI1
1
PTA0
KBI0
Bit 0