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MC908QT2A Datasheet(PDF) 51 Page - Freescale Semiconductor, Inc |
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MC908QT2A Datasheet(HTML) 51 Page - Freescale Semiconductor, Inc |
51 / 200 page MC68HC908QYA/QTA Family Data Sheet, Rev. 2 Freescale Semiconductor 51 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 BUSCLKX2 ISTOP AWUIREQ CLRLOGIC RESET AWUL TO PTA READ, BIT 6 Q AWUIE TO KBI INTERRUPT LOGIC (SEE Figure 9-2) BUSCLKX2 OSCENINSTOP (FROM CONFIG2) M U X |
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