MC68HC908LJ12 Datasheet, PDF (341/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Input/Output (I/O) Ports
Addr.
Register Name
Bit 7
$0000
Read:
Port A Data Register
(PTA)
Write:
Reset:
PTA7
$0001
Read:
Port B Data Register
(PTB)
Write:
Reset:
PTB7
$0002
Read:
Port C Data Register
(PTC)
Write:
Reset:
PTC7
$0003
Read:
Port D Data Register
(PTD)
Write:
Reset:
PTD7
Read:
$0004
Data Direction Register A
(DDRA)
Write:
Reset:
DDRA7
0
Read:
$0005
Data Direction Register B
(DDRB)
Write:
Reset:
DDRB7
0
Read:
$0006
Data Direction Register C
(DDRC)
Write:
Reset:
DDRC7
0
Read:
$0007
Data Direction Register D
(DDRD)
Write:
Reset:
DDRD7
0
$000C
Port-B LED Control ^{Read: 0}
Register Write:
(LEDB) _{Reset: 0}
6
PTA6
PTB6
PTC6
PTD6
DDRA6
0
DDRB6
0
DDRC6
0
DDRD6
0
0
0
5
PTA5
PTB5
PTC5
PTD5
DDRA5
0
DDRB5
0
DDRC5
0
DDRD5
0
LEDB5
0
4
3
PTA4 PTA3
Unaffected by reset
PTB4 PTB3
Unaffected by reset
PTC4 PTC3
Unaffected by reset
PTD4 PTD3
Unaffected by reset
DDRA4 DDRA3
0
0
DDRB4 DDRB3
0
0
DDRC4 DDRC3
0
0
DDRD4 DDRD3
0
0
LEDB4 LEDB3
0
0
2
PTA2
PTB2
PTC2
PTD2
DDRA2
0
DDRB2
0
DDRC2
0
DDRD2
0
LEDB2
0
1
PTA1
PTB1
PTC1
PTD1
DDRA1
0
DDRB1
0
DDRC1
0
DDRD1
0
LEDB1
0
Bit 0
PTA0
PTB0
PTC0
PTD0
DDRA0
0
DDRB0
0
DDRC0
0
DDRD0
0
LEDB0
0
Figure 17-1. I/O Port Register Summary
Technical Data
342
Input/Output (I/O) Ports
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor