mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 45

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

4.1 Introduction
4.2 Features
MC68HC908QF4 — Rev. 1.0
MOTOROLA
$0000
$001A
$001B
Addr.
Data Sheet — MC68HC908QF4
Keyboard Interrupt Enable
Register Name
Port A Data Register
and Control Register
Register (KBIER)
Keyboard Status
See page 48.
See page 48.
See page 49.
(KBSCR)
This section describes the auto wakeup module (AWU). The AWU generates a
periodic interrupt during stop mode to wake the part up without requiring an
external signal.
Features of the auto wakeup module include:
Figure 4-1
conjuction with the AWU.
(PTA)
•
•
•
•
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
One internal interrupt with separate interrupt enable bit, sharing the same
keyboard interrupt vector and keyboard interrupt mask bit
Exit from low-power stop mode without external signals
Selectable timeout periods
Dedicated low power internal oscillator separate from the main system clock
sources
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 4-1. AWU Register Summary
provides a summary of the input/output (I/O) registers used in
Bit 7
0
0
0
0
0
Figure 4-2
Go to: www.freescale.com
Auto Wakeup Module (AWU)
= Unimplemented
AWUIE
AWUL
6
0
0
0
Section 4. Auto Wakeup Module (AWU)
is a block diagram of the AWU.
KBIE5
PTA5
5
0
0
0
Unaffected by reset
KBIE4
PTA4
4
0
0
0
KBIE3
PTA3
KEYF
3
0
0
KBIE2
ACKK
PTA2
2
0
0
0
IMASKK
KBIE1
PTA1
1
0
0
Data Sheet
MODEK
KBIE0
PTA0
Bit 0
0
0
45