mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 111

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

13.1 Introduction
MC68HC908QF4 — Rev. 1.0
MOTOROLA
$000B
$000C
$0000
$0001
$0004
$0005
Addr.
Data Sheet — MC68HC908QF4
Port A Input Pullup Enable
Port B Input Pullup Enable
Data Direction Register A
Data Direction Register B
Register Name
NOTE:
Port A Data Register
Port B Data Register
Register (PTAPUE)
Register (PTBPUE)
See page 112.
See page 115.
See page 113.
See page 115.
See page 114.
See page 116.
(DDRA)
(DDRB)
The MC68HC908QF4 has thirteen bidirectional pins and one input only pin. All I/O
pins are programmable as inputs or outputs.
Connect any unused I/O pins to an appropriate logic level, either V
Although the I/O ports do not require termination for proper operation, termination
reduces excess current consumption and the possibility of electrostatic damage.
Figure 13-1
(PTA)
(PTB)
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Write:
Write:
Freescale Semiconductor, Inc.
Figure 13-1. I/O Port Register Summary
For More Information On This Product,
PTBPUE7 PTBPUE6 PTBPUE5 PTBPUE4 PTBPUE3 PTBPUE2 PTBPUE1 PTBPUE0
OSC2EN
provides a summary of the I/O registers.
DDRB7
PTB7
Bit 7
R
R
R
0
0
0
0
Go to: www.freescale.com
Input/Output (I/O) Ports
= Reserved
DDRB6
AWUL
PTB6
R
6
0
0
0
0
PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
DDRA5
DDRB5
PTA5
PTB5
Section 13. Input/Output (I/O) Ports
5
0
0
0
0
DDRA4
DDRB4
Unaffected by reset
Unaffected by reset
PTA4
PTB4
4
0
0
0
0
= Unimplemented
DDRA3
DDRB3
PTA3
PTB3
3
0
0
0
0
DDRB2
PTA2
PTB2
2
0
0
0
0
0
DDRA1
DDRB1
PTA1
PTB1
DD
1
0
0
0
0
or V
Data Sheet
SS
DDRA0
DDRB0
PTA0
PTB0
.
Bit 0
0
0
0
0
111