參數(shù)資料
型號: MC68HC05C9AMFN
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 58/124頁
文件大小: 774K
代理商: MC68HC05C9AMFN
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
$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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