mc68hc908jw32 Freescale Semiconductor, Inc, mc68hc908jw32 Datasheet - Page 165

• Manufacturer Part Number: mc68hc908jw32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 13
Input/Output (I/O) Ports
13.1 Introduction
Twenty-nine (29) bidirectional input-output (I/O) pins form five parallel ports. All I/O pins are
programmable as inputs or outputs.
Freescale Semiconductor
$0000
$0001
$0002
$0003
$0008
$0004
$0005
Addr.
Data Direction Register A
Data Direction Register B
Register Name
Port C Data Register
Port D Data Register
Port A Data Register
Port B Data Register
Port E Data Register
Connect any unused I/O pins to an appropriate logic level, either V
V
termination reduces excess current consumption and the possibility of
electrostatic damage.
SS
. Although the I/O ports do not require termination for proper operation,
(DDRA)
(DDRB)
(PTA)
(PTB)
(PTC)
(PTD)
(PTE)
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Write:
Write:
Write:
Figure 13-1. I/O Port Register Summary
DDRA7
PTA7
PTD7
PTE7
Bit 7
MC68HC908JW32 Data Sheet, Rev. 5
0
0
= Unimplemented
DDRA6
PTA6
PTD6
PTE6
6
0
0
NOTE
DDRA5
DDRB5
PTA5
PTB5
PTD5
PTE5
5
0
0
DDRA4
Unaffected by reset
Unaffected by reset
Unaffected by reset
Unaffected by reset
Unaffected by reset
PTA4
PTD4
PTE4
4
0
0
DDRA3
PTA3
PTC3
PTD3
PTE3
3
0
0
DDRA2
PTA2
PTC2
PTD2
PTE2
2
0
0
DD
or
DDRA1
DDRB1
PTC1
PTD1
PTA1
PTB1
1
0
0
DDRA0
DDRB0
PTC0
PTD0
PTA0
PTB0
Bit 0
0
0
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