M68HC08 Datasheet, PDF (36/230 Pages) Motorola, Inc – Microcontrollers

Memory
Addr.
$0000
$0001
$0002
Register Name
Port A Data Register ^Read:
(PTA) Write:
See page 163. _Reset:
Port B Data Register ^Read:
(PTB) Write:
See page 167. _Reset:
Unimplemented
Bit 7
0
U
PTB7
6
AWUL
0
PTB6
5
PTA5
4
PTA4
3
PTA3
2
PTA2
U
U
U
U
PTB5 PTB4 PTB3 PTB2
Unaffected by reset
1
PTA1
U
PTB1
Bit 0
PTA0
U
PTB0
$0003
Unimplemented
Data Direction Register A ^{Read: 0}
$0004
(DDRA) Write:
See page 164. _{Reset: 0}
$0005
Data Direction Register B ^Read:
(DDRB) Write:
See page 168. _Reset:
DDRB7
0
$0006
↓
$000A
Unimplemented
Unimplemented
0
0
DDRB6
0
DDRA5
0
DDRB5
0
DDRA4
0
DDRB4
0
DDRA3
0
DDRB3
0
0
0
DDRB2
0
DDRA1
0
DDRB1
0
DDRA0
0
DDRB0
0
Port A Input Pullup Enable ^Read: _OSC2EN
0
PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
$000B
Register (PTAPUE) Write:
See page 166. _{Reset: 0}
0
0
0
0
0
0
0
Port B Input Pullup Enable ^Read: _{PTBPUE7 PTBPUE6 PTBPUE5 PTBPUE4 PTBPUE3 PTBPUE2 PTBPUE1 PTBPUE0}
$000C
Register (PTBPUE) Write:
See page 169. _{Reset: 0}
0
0
0
0
0
0
0
$000D
↓
$0019
Unimplemented
Unimplemented
= Unimplemented
R = Reserved U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 6)
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
36
Memory
MOTOROLA