MC68HC908RK2 Datasheet, PDF (174/232 Pages) Motorola, Inc – Microcontroller Unit

Input/Output (I/O) Ports
Addr. Register Name
Bit 7
6
5
$0000
Read:
Port A Data Register
(PTA) Write:
See page 175.
Reset:
PTA7
PTA6
PTA5
$0001
Read:
Port B Data Register
(PTB) Write:
See page 178.
Reset:
PTB5
$0004
Read:
Data Direction Register A
(DDRA) Write:
See page 176.
Reset:
DDRA7
0
DDRA6
0
DDRA5
0
Read:
0
Data Direction Register B
MCLKEN
$0005
(DDRB) Write:
See page 179.
Reset: 0
0
DDRB5
0
= Unimplemented
4
3
PTA4 PTA3
Unaffected by reset
PTB4 PTB3
Unaffected by reset
DDRA4 DDRA3
0
0
DDRB4 DDRB3
0
0
2
PTA2
PTB2
DDRA2
0
DDRB2
0
1
PTA1
PTB1
DDRA1
0
DDRB1
0
Bit 0
PTA0
PTB0
DDRA0
0
DDRB0
0
Figure 13-1. I/O Port Register Summary
Advance Information
174
Input/Output (I/O) Ports
MC68HC908RK2 — Rev. 4.0
MOTOROLA