Datasheet

MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
36 Memory MOTOROLA
Memory
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Addr.Register Name Bit 7654321Bit 0
$0000
Port A Data Register
(PTA)
See page 163.
Read: 0 AWUL
PTA5 PTA4 PTA3
PTA2
PTA1 PTA0
Write:
Reset:U0UUUUUU
$0001
Port B Data Register
(PTB)
See page 167.
Read:
PTB7 PTB6 PTB5 PTB4 PTB3 PTB2 PTB1 PTB0
Write:
Reset: Unaffected by reset
$0002 Unimplemented
$0003 Unimplemented
$0004
Data Direction Register A
(DDRA)
See page 164.
Read: 0 0
DDRA5 DDRA4 DDRA3
0
DDRA1 DDRA0
Write:
Reset:00000000
$0005
Data Direction Register B
(DDRB)
See page 168.
Read:
DDRB7 DDRB6 DDRB5 DDRB4 DDRB3 DDRB2 DDRB1 DDRB0
Write:
Reset:00000000
$0006
↓
$000A
Unimplemented
Unimplemented
$000B
Port A Input Pullup Enable
Register (PTAPUE)
See page 166.
Read:
OSC2EN
0
PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
Write:
Reset:00000000
$000C
Port B Input Pullup Enable
Register (PTBPUE)
See page 169.
Read:
PTBPUE7 PTBPUE6 PTBPUE5 PTBPUE4 PTBPUE3 PTBPUE2 PTBPUE1 PTBPUE0
Write:
Reset:00000000
$000D
↓
$0019
Unimplemented
Unimplemented
= Unimplemented R = Reserved U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 6)