mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 188

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
16.2 Introduction
Technical Data
186
Addr.
$0000
$0001
$0002
$0003
$0004
$0005
Data Direction Register A
Data Direction Register B
NOTE:
Port A Data Register
Port B Data Register
Port C Data Register
Port D Data Register
Register Name
(DDRA)
(DDRB)
Forty bidirectional input/output (I/O) pins form six parallel ports. All I/O
pins are programmable as inputs or outputs.
Connect any unused I/O pins to an appropriate logic level, either V
V
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
(PTA)
(PTB)
(PTC)
(PTD)
SS
Figure 16-1. I/O Port Register Summary
. Although the I/O ports do not require termination for proper
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Write:
Write:
DDRA7
DDRB7
Bit 7
PTA7
PTB7
R
R
R
0
0
0
0
Input/Output (I/O) Ports
= Reserved
DDRA6
DDRB6
PTA6
PTB6
R
R
6
0
0
0
0
DDRA5
DDRB5
PTD5
PTA5
PTB5
R
5
0
0
0
Unaffected by reset
Unaffected by reset
Unaffected by reset
Unaffected by reset
DDRA4
DDRB4
PTA4
PTB4
PTC4
PTD4
4
0
0
DDRA3
DDRB3
PTA3
PTB3
PTC3
PTD3
3
0
0
DDRA2
DDRB2
Freescale Semiconductor
PTD2
PTA2
PTB2
PTC2
2
0
0
MC68HC08QA24
DDRA1
DDRB1
PTC1
PTD1
PTA1
PTB1
1
0
0
DDRA0
DDRB0
Bit 0
DD
PTA0
PTB0
PTC0
PTD0
0
0
or