MC68HC08AS32 Datasheet, PDF (139/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Data Sheet — MC68HC08AS32
Section 11. Input/Output (I/O) Ports
11.1 Introduction
Forty bidirectional input/output (I/O) pins form six parallel ports. All I/O pins are
programmable as inputs or outputs.
NOTE:
Connect any unused I/O pins to an appropriate logic level, either V_DD or V_SS.
Although the I/O ports do not require termination for proper operation, termination
reduces excess current consumption and the possibility of electrostatic damage.
Addr.
$0000
$0001
$0002
$0003
$0004
$0005
$0006
Register Name
Bit 7
Port A Data Register ^Read:
(PTA) Write:
See page 140. _Reset:
PTA7
Port B Data Register ^Read:
(PTB) Write:
See page 142. _Reset:
PTB7
Port C Data Register ^Read:
0
(PTC) Write: R
See page 144. _Reset:
Port D Data Register ^Read:
0
(PTD) Write: R
See page 146. _Reset:
Data Direction Register A ^Read:
(DDRA) Write:
See page 141. _Reset:
DDRA7
0
Data Direction Register B ^Read:
(DDRB) Write:
See page 143. _Reset:
DDRB7
0
Data Direction Register C
(DDRC)
Read:
Write:
MCLKEN
See page 145. _Reset:
0
R
6
PTA6
5
PTA5
PTB6
PTB5
0
0
R
R
PTD6 PTD5
DDRA6 DDRA5
0
0
DDRB6 DDRB5
0
0
0
0
R
R
0
0
= Reserved
4
3
PTA4
PTA3
Unaffected by reset
PTB4
PTB3
Unaffected by reset
PTC4
PTC3
Unaffected by reset
PTD4
PTD3
Unaffected by reset
DDRA4 DDRA3
0
0
DDRB4 DDRB3
0
0
DDRC4 DDRC3
0
0
Figure 11-1. I/O Port Register Summary
2
PTA2
PTB2
PTC2
PTD2
DDRA2
0
DDRB2
0
DDRC2
0
1
PTA1
PTB1
PTC1
PTD1
DDRA1
0
DDRB1
0
DDRC1
0
Bit 0
PTA0
PTB0
PTC0
PTD0
DDRA0
0
DDRB0
0
DDRC0
0
MC68HC08AS32 — Rev. 4.1
Freescale Semiconductor
Data Sheet
139