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MC908QL2M Datasheet(Hoja de datos) 57 Page - Motorola, Inc

No. de Pieza. MC908QL2M
Descripción  Microcontrollers
Descarga  222 Pages
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Fabricante  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
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 57 page
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MC68HC908QL4 • MC68HC908QL3 • MC68HC908QL2 Data Sheet, Rev. 4
Freescale Semiconductor
57
Chapter 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 4-1 is a block diagram of the
AWU.
Figure 4-1. Auto Wakeup Interrupt Request Generation Logic
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
Option to allow bus clock source to run the AWU if enabled in STOP
D
R
VDD
INT RC OSC
EN
32 kHz
CLK
RST
OVERFLOW
AUTOWUGEN
SHORT
COPRS (FROM CONFIG1)
1 = DIV 29
0 = DIV 214
E
RESET
ACKK
CLEAR
RST
RESET
CLK
(CGMXCLK)
BUSCLKX4
ISTOP
AWUIREQ
CLRLOGIC
RESET
AWUL
TO PTA READ, BIT 6
Q
AWUIE
TO KBI INTERRUPT LOGIC
(SEE Figure 9-2)
BUSCLKX4
OSCENINSTOP (FROM CONFIG2)
M
U
X




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