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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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M68HC08 Datasheet(PDF) 39 Page - Freescale Semiconductor, Inc |
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M68HC08 Datasheet(HTML) 39 Page - Freescale Semiconductor, Inc |
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39 / 124 page  MC68HC05C9A Advance Information Data Sheet, Rev. 5.1 Freescale Semiconductor 39 Chapter 6 Low-Power Modes 6.1 Introduction This section describes the low-power stop and wait modes. 6.2 Stop Mode The STOP instruction places the microcontroller unit (MCU) in its lowest-power consumption mode. In stop mode, the internal oscillator is turned off, halting all internal processing, including timer operation. During stop mode, the TCR bits are altered to remove any pending timer interrupt request and to disable any further timer interrupts. The timer prescaler is cleared. The I bit in the condition code register (CCR) is cleared to enable external interrupts. All other registers and memory remain unaltered. All input/output (I/O) lines remain unchanged. The processor can be brought out of stop mode only by an external interrupt or reset. See Figure 6-1. Figure 6-1. Stop Recovery Timing Diagram $3FFE $3FFE $3FFE $3FFE $3FFF INTERNAL ADDRESS BUS INTERNAL CLOCK IRQ (3) IRQ (2) RESET OSC1 (1) t ILCH 4064 t CYC RESET OR INTERRUPT VECTOR FETCH t LIH t RL Notes: 1. Represents the internal gating of the OSC1 pin 2. IRQ pin edge-sensitive mask option 3. IRQ pin level and edge-sensitive mask option |
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