MC68HC908AT32 Datasheet, PDF (38/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

Memory Map
2.2 Input/Output (I/O) Section
Addresses $0000–$003F, shown in Figure 2-2, contain most of the control, status, and data registers.
Additional I/O registers have these addresses:
• $FE00 (SIM break status register, SBSR)
• $FE01 (SIM reset status register, SRSR)
• $FE03 (SIM break flag control register, SBFCR)
• $FE09 (configuration write-once register, CONFIG-2)
• $FE0B (FLASH control register, FLCR)
• $FE0C and $FE0D (break address registers, BRKH and BRKL)
• $FE0E (break status and control register, BRKSCR)
• $FE0F (LVI status register, LVISR)
• $FE1C (EEPROM non-volatile register, EENVR)
• $FE1D (EEPROM control register, EECR)
• $FE1F (EEPROM array configuration register, EEACR)
• $FF80 (FLASH block protect register, FLBPR)
• $FFFF (COP control register, COPCTL)
Table 2-1 is a list of vector locations.
In Table 2-1, all MC68HC08AZ32 emulator specific register bits will be in bold face type. All
MC68HC08AS20 emulator specific registers will be in italic face type. Those in regular type are common
to both parts.
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$0000
Port A Data Register ^Read: _PTA7
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
(PTA) Write:
See page 235. _Reset:
Unaffected by reset
$0001
Port B Data Register ^Read:
(PTB) Write:
See page 237. _Reset:
PTB7
PTB6
PTB5
PTB4 PTB3
Unaffected by reset
PTB2
PTB1
PTB0
$0002
Port C Data Register ^{Read: 0}
(PTC) Write: R
See page 239. _Reset:
0
PTC5 PTC4 PTC3 PTC2 PTC1 PTC0
R
Unaffected by reset
$0003
Port D Data Register ^Read:
(PTD) Write:
See page 241. _Reset:
PTD7
PTD6
PTD5
PTD4 PTD3
Unaffected by reset
PTD2
PTD1
PTD0
$0004
Data Direction Register A ^Read:
(DDRA) Write:
See page 235. _Reset:
DDRA7
0
DDRA6
0
DDRA5
0
DDRA4
0
DDRA3
0
DDRA2
0
DDRA1
0
DDRA0
0
Italic Type = MC68HC08AS20 Specific
U = Unaffected
Boldface Type = MC68HC08AZ32 Specific
= Unimplemented
R = Reserved
X = Indeterminate
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 9)
MC68HC908AT32 Data Sheet, Rev. 3.1
38
Freescale Semiconductor