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M68HC08 데이터시트(PDF) 39 Page - Freescale Semiconductor, Inc

부품명 M68HC08
상세설명  Microcontrollers
PDF  124 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC08 데이터시트(HTML) 39 Page - Freescale Semiconductor, Inc

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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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