Datasheet

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Memory Map

Input/Output (I/O) Section

MC68HC908GR8 — Rev 4.0 Technical Data

MOTOROLA Memory Map 39

Addr.Register Name Bit 7654321Bit 0

$0000

Port A Data Register

(PTA)

PTA3 PTA2 PTA1 PTA0

Write:

Reset: Unaffected by reset

$0001

Port B Data Register

(PTB)

PTB5 PTB4 PTB3 PTB2 PTB1 PTB0

Write:

Reset: Unaffected by reset

$0002

Port C Data Register

(PTC)

PTC1 PTC0

Write:

Reset: Unaffected by reset

$0003

Port D Data Register

(PTD)

PTD6 PTD5 PTD4 PTD3 PTD2 PTD1 PTD0

Write:

Reset: Unaffected by reset

$0004

Data Direction Register A

(DDRA)

DDRA3 DDRA2 DDRA1 DDRA0

Write:

Reset:00000000

$0005

Data Direction Register B

(DDRB)

DDRB5 DDRB4 DDRB3 DDRB2 DDRB1 DDRB0

Write:

Reset:00000000

$0006

Data Direction Register C

(DDRC)

DDRC1 DDRC0

Write:

Reset:00000000

$0007

Data Direction Register D

(DDRD)

DDRD6 DDRD5 DDRD4 DDRD3 DDRD2 DDRD1 DDRD0

Write:

Reset:00000000

$0008

Port E Data Register

(PTE)

PTE1 PTE0

Write:

Reset: Unaffected by reset

$0009 Unimplemented

Read:

Write:

Reset:00000000

= Unimplemented R = Reserved U = Unaffected

Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 8)

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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