Datasheet

Input/Output (I/O) Section
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
Freescale Semiconductor 29
Addr.Register Name Bit 7654321Bit 0
$0000
Port A Data Register
(PTA)
See page 158.
Read:
PTA7 PTA6 PTA5 PTA4 PTA3 PTA2 PTA1 PTA0
Write:
Reset: Unaffected by reset
$0001
Port B Data Register
(PTB)
See page 160.
Read:
PTB7 PTB6 PTB5 PTB4 PTB3 PTB2 PTB1 PTB0
Write:
Reset: Unaffected by reset
$0002
Port C Data Register
(PTC)
See page 162.
Read: 1
PTC6 PTC5 PTC4 PTC3 PTC2 PTC1 PTC0
Write:
Reset: Unaffected by reset
$0003
Port D Data Register
(PTD)
See page 164.
Read:
PTD7 PTD6 PTD5 PTD4 PTD3 PTD2 PTD1 PTD0
Write:
Reset: Unaffected by reset
$0004
Data Direction Register A
(DDRA)
See page 158.
Read:
DDRA7 DDRA6 DDRA5 DDRA4 DDRA3 DDRA2 DDRA1 DDRA0
Write:
Reset:00000000
$0005
Data Direction Register B
(DDRB)
See page 161.
Read:
DDRB7 DDRB6 DDRB5 DDRB4 DDRB3 DDRB2 DDRB1 DDRB0
Write:
Reset:00000000
$0006
Data Direction Register C
(DDRC)
See page 162.
Read: 0
DDRC6 DDRC5 DDRC4 DDRC3 DDRC2 DDRC1 DDRC0
Write:
Reset:00000000
$0007
Data Direction Register D
(DDRD)
See page 165.
Read:
DDRD7 DDRD6 DDRD5 DDRD4 DDRD3 DDRD2 DDRD1 DDRD0
Write:
Reset:00000000
$0008
Port E Data Register
(PTE)
See page 167.
Read: 0 0
PTE5 PTE4 PTE3 PTE2 PTE1 PTE0
Write:
Reset: Unaffected by reset
$0009
ESCI Prescaler Register
(SCPSC)
See page 206.
Read:
PDS2 PDS1 PDS0 PSSB4 PSSB3 PSSB2 PSSB1 PSSB0
Write:
Reset:00000000
$000A
ESCI Arbiter Control
Register (SCIACTL)
See page 209.
Read:
AM1
ALOST
AM0 ACLK
AFIN ARUN AOVFL ARD8
Write:
Reset:00000000
$000B
ESCI Arbiter Data
Register (SCIADAT)
See page 210.
Read:
ARD7 ARD6 ARD5 ARD4 ARD3 ARD2 ARD1 ARD0
Write:
Reset:00000000
= Unimplemented R = Reserved U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 8)