Advance Information MC68HC908MR16/MC68HC908MR32 — Rev. 4.0
42 Memory Map MOTOROLA
Memory Map
Addr. Register Name Bit 7 6 5 4 3 2 1 Bi t 0
$0000 Port A Data Register
(PTA)
See page 310.
Read: PTA7 PTA6 PTA5 P TA4 PTA3 PTA2 P TA1 PTA0
Write:
Reset: Unaffected by reset
$0001 Port B Data Register
(PTB)
See page 312.
Read: PTB7 PTB6 PTB5 P TB4 PTB3 PTB2 P TB1 PTB0
Write:
Reset: Unaffected by reset
$0002 Port C Data Register
(PTC)
See page 314.
Read: 0 PTC6 PTC5 PTC4 PTC3 PTC2 PTC1 PTC0
Write: R
Reset: Unaffected by reset
$0003 Port D Data Register
(PTD)
See page 316.
Read: 0 PTD6 PTD5 PTD4 PTD3 PTD2 PTD1 PTD0
Write: R R R R R R R R
Reset: Unaffected by reset
$0004 Data Direction Register A
(DDRA)
See page 310.
Read: DDRA7 DDRA6 DDRA5 DD RA4 DDRA3 DDRA2 DDRA1 DDRA0
Write:
Reset: 0 0 0 0 0 0 0 0
$0005 Data Direction Register B
(DDRB)
See page 312.
Read: DDRB7 DDRB6 DDRB5 DD RB4 DDRB3 DDRB2 DDRB1 DDRB0
Write:
Reset: 0 0 0 0 0 0 0 0
$0006 Data Direction Register C
(DDRC)
See page 314.
Read: 0 DDRC6 DDRC5 DDRC4 DDRC3 DDRC2 DDRC1 DDRC0
Write: R
Reset: 0 0 0 0 0 0 0 0
$0007 Unimplemented
$0008 Port E Data Register
(PTE)
See page 317.
Read: PTE7 PTE6 PTE5 P TE4 PTE3 PTE2 P TE1 PTE0
Write:
Reset: Unaffected by reset
$0009 Port F Data Register
(PTF)
See page 319.
Read: 0 0 PTF5 PTF4 PTF3 PTF2 PTF1 PTF0
Write: R R
Reset: Unaffected by reset
U = Unaffected X = Indeterminate R = Reserved Bold = Buffered = Unimplemented
Figure 2-2. Control, Status, and Data Registers Summary (Sheet 1 of 10)