MC68HC908KX8 Datasheet, PDF (150/310 Pages) Motorola, Inc – Microcontrollers

Input/Output (I/O) Ports
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
Port A Data Register
PTA4 PTA3 PTA2 PTA1 PTA0
$0000
(PTA) Write:
See page 151.
Reset:
Unaffected by reset
$0001
Read:
Port B Data Register
(PTB) Write:
See page 155.
Reset:
PTB7
PTB6
PTB5 PTB4 PTB3 PTB2
Unaffected by reset
PTB1
PTB0
Read: 0
0
0
Data Direction Register A
DDRA4 DDRA3 DDRA2 DDRA1 DDRA0
$0004
(DDRA) Write:
See page 152.
Reset: 0
0
0
0
0
0
0
0
$0005
Read:
Data Direction Register B
(DDRB) Write:
See page 156.
Reset:
DDRB7
0
DDRB6
0
DDRB5
0
DDRB4
0
DDRB3
0
DDRB2
0
DDRB1
0
DDRB0
0
Read: 0
0
0
Port A Input Pullup Enable
PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
$000D
Register (PTAPUE) Write:
See page 154.
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 10-1. I/O Port Register Summary
10.3 Port A
Port A is a 5-bit special function port on the MC68HC908KX8 that shares
all of its pins with the keyboard interrupt module (KBI) and the 2-channel
timer. Port A contains software programmable pullup resistors enabled
when a port pin is used as a general-function input. Port A pins are also
high-current port pins with 15-mA source/15-mA sink capabilities.
Technical Data
150
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Input/Output (I/O) Ports
MOTOROLA