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M68HC08 bảng dữ liệu(PDF) 39 Page - Freescale Semiconductor, Inc

tên linh kiện M68HC08
Giải thích chi tiết về linh kiện  Microcontrollers
PDF  124 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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M68HC08 bảng dữ liệu(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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