MC68HC05P9ACDW FREESCALE [Freescale Semiconductor, Inc], MC68HC05P9ACDW Datasheet - Page 66

• Manufacturer Part Number: MC68HC05P9ACDW
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Parallel I/O Ports
Introduction
66
Addr.
$0000
$0001
$0002
$0003
$0004 Data Direction Register A (DDRA)
$0005 Data Direction Register B (DDRB)
NOTE:
Port C Data Register (PORTC)
Port D Data Register (PORTD)
Port B Data Register (PORTB)
Port A Data Register (PORTA)
Name:
Twenty bidirectional pins and one input-only pin form four parallel
input/output (I/O) ports. All the bidirectional port 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.
SS
Figure 28. Parallel I/O Port Register Summary
Freescale Semiconductor, Inc.
. Although the I/O ports do not require termination for proper
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R/W
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Parallel I/O Ports
DDRA7 DDRA6 DDRA5 DDRA4 DDRA3 DDRA2 DDRA1 DDRA0
DDRB7 DDRB6 DDRB5
Bit 7
PC7
PD7
PA7
PB7
0
0
= Unimplemented
PB6
PC6
PA6
6
0
0
0
PB5
PC5
PD5
PA5
5
0
0
Unaffected by reset
Unaffected by reset
Unaffected by reset
Unaffected by reset
PC4
PA4
4
0
1
0
0
0
PC3
PA3
3
0
0
0
0
0
PC2
PA2
2
0
0
0
0
0
PC1
PA1
6-mc68hc05p9a
MOTOROLA
1
0
0
0
0
0
Bit 0
DD
PC0
PA0
0
0
0
0
0
or