參數(shù)資料
型號(hào): MC68HC908QY4VDT
廠商: MOTOROLA INC
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封裝: TSSOP-16
文件頁(yè)數(shù): 137/192頁(yè)
文件大?。?/td> 3292K
代理商: MC68HC908QY4VDT
MC68HC908QY/QT Family — Rev. 3
Data Sheet
MOTOROLA
Auto Wakeup Module (AWU)
49
Data Sheet — MC68HC908QY/QT Family
Section 4. Auto Wakeup Module (AWU)
4.1 Introduction
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. Figure 4-2 is a block diagram of the AWU.
4.2 Features
Features of the auto wakeup module include:
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
Figure 4-1 provides a summary of the input/output (I/O) registers used in
conjuction with the AWU.
Addr.
Register Name
Bit 7
654321
Bit 0
$0000
Port A Data Register
(PTA)
Read:
0
AWUL
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Write:
Reset:
Unaffected by reset
$001A
Keyboard Status
and Control Register
(KBSCR)
Read:
0000
KEYF
0
IMASKK
MODEK
Write:
ACKK
Reset:
00000000
$001B
Keyboard Interrupt Enable
Register (KBIER)
Read:
0
AWUIE
KBIE5
KBIE4
KBIE3
KBIE2
KBIE1
KBIE0
Write:
Reset:
00000000
= Unimplemented
Figure 4-1. AWU Register Summary
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