MC68HC908MR8 Datasheet, PDF (280/372 Pages) Motorola, Inc – Microcontrollers

Input/Output (I/O) Ports
Addr.
$0000
$0001
$0002
$0003
Register Name
Bit 7 6
5
4
3
2
1 Bit 0
Port A Data Register
(PTA)
See page 281.
Read:
Write:
Reset:
PTA6 PTA5 PTA4 PTA3 PTA2 PTA1 PTA0
Unaffected by reset
Port B Data Register
(PTB)
See page 284.
Read:
Write:
Reset:
PTB6 PTB5 PTB4 PTB3 PTB2 PTB1 PTB0
Unaffected by reset
Port C Data Register
(PTC)
See page 287.
Read:
Write:
Reset:
Unaffected by reset
PTC1 PTC0
Unimplemented
$0004
$0005
$0006
Read:
Data Direction Register A
(DDRA) Write:
See page 282.
Reset: 0
DDRA DDRA DDRA DDRA DDRA DDRA DDRA
6
5
4
3
2
1
0
0
0
0
0
0
0
0
Read:
Data Direction Register B
(DDRB) Write:
See page 284.
Reset: 0
DDRB DDRB DDRB DDRB DDRB DDRB DDRB
6
5
4
3
2
1
0
0
0
0
0
0
0
0
Read:
Data Direction Register C
(DDRC) Write:
DDRC DDRC
1
0
See page 287.
Reset: U
U
U
U
U
U
0
0
= Unimple-
mented
R ^{= Reserved}
U ^{= Unaffected}
Figure 14-1. I/O Port Register Summary
Technical Data
280
Input/Output (I/O) Ports
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor