
Memory
MC68HC908GT16 MC68HC908GT8 Data Sheet, Rev. 3
30
Freescale Semiconductor
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$0000
Port A Data Register
(PTA)
See page 124.
Read:
PTA7
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Write:
Reset:
Unaffected by reset
$0001
Port B Data Register
(PTB)
See page 126.
Read:
PTB7
PTB6
PTB5
PTB4
PTB3
PTB2
PTB1
PTB0
Write:
Reset:
Unaffected by reset
$0002
Port C Data Register
(PTC)
See page 128.
Read:
0
PTC6
PTC5
PTC4
PTC3
PTC2
PTC1
PTC0
Write:
Reset:
Unaffected by reset
$0003
Port D Data Register (
PTD)
See page 130.
Read:
PTD7
PTD6
PTD5
PTD4
PTD3
PTD2
PTD1
PTD0
Write:
Reset:
Unaffected by reset
$0004
Data Direction Register A
(DDRA)
See page 124.
Read:
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
0
0
0
0
0
0
0
0
$0005
Data Direction Register B
(DDRB)
See page 126.
Read:
DDRB7
DDRB6
DDRB5
DDRB4
DDRB3
DDRB2
DDRB1
DDRB0
Write:
Reset:
0
0
0
0
0
0
0
0
$0006
Data Direction Register C
(DDRC)
See page 128.
Read:
0
DDRC6
DDRC5
DDRC4
DDRC3
DDRC2
DDRC1
DDRC0
Write:
Reset:
0
0
0
0
0
0
0
0
$0007
Data Direction Register D
(DDRD)
See page 131.
Read:
DDRD7
DDRD6
DDRD5
DDRD4
DDRD3
DDRD2
DDRD1
DDRD0
Write:
Reset:
0
0
0
0
0
0
0
0
$0008
Port E Data Register
(PTE)
See page 133.
Read:
0
0
0
PTE4
PTE3
PTE2
PTE1
PTE0
Write:
Reset:
Unaffected by reset
$0009
ESCI Prescaler Register
(SCPSC)
See page 170.
Read:
PDS2
PDS1
PDS0
PSSB4
PSSB3
PSSB2
PSSB1
PSSB0
Write:
Reset:
0
0
0
0
0
0
0
0
$000A
ESCI Arbiter Control
Register (SCIACTL)
See page 174.
Read:
AM1
ALOST
AM0
ACLK
AFIN
ARUN
AOVFL
ARD8
Write:
Reset:
0
0
0
0
0
0
0
0
$000B
ESCI Arbiter Data
Register (SCIADAT)
See page 175.
Read:
ARD7
ARD6
ARD5
ARD4
ARD3
ARD2
ARD1
ARD0
Write:
Reset:
0
0
0
0
0
0
0
0
$000C
Data Direction Register E
(DDRE)
See page 134.
Read:
0
0
0
DDRE4
DDRE3
DDRE2
DDRE1
DDRE0
Write:
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
R = Reserved
U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 7)