參數(shù)資料
型號: MC16S2CPU20B1
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, 20.97 MHz, MICROCONTROLLER, PQFP100
封裝: TQFP-100
文件頁數(shù): 16/104頁
文件大小: 812K
代理商: MC16S2CPU20B1
MC68HC16S2
MOTOROLA
MC68HC16S2TS/D
19
Figure 8 LPSTOP Flowchart
3.4 System Protection Block
System protection includes a bus monitor, a halt monitor, a spurious interrupt monitor, and a software
watchdog timer. These functions reduce the number of external components required for complete sys-
tem control. Figure 9 shows the system protection block.
USING
EXTERNAL CLOCK?
NO
YES
USE SYSTEM CLOCK
AS SIMCLK IN LPSTOP?
NO
YES
SET STSIM = 1
fsimclk
1 = f
sys
IN LPSTOP
WANT CLKOUT
ON IN LPSTOP?
NO
YES
NO
YES
WANT CLKOUT
ON IN LPSTOP?
SET STSIM = 0
fsimclk
1 = f
ref
IN LPSTOP
SET STEXT = 1
fclkout
2 = f
sys
feclk = ÷ fsys
IN LPSTOP
SET STEXT = 0
fclkout
2 = 0 Hz
feclk = 0 Hz
IN LPSTOP
SET STEXT = 1
fclkout
2 = f
ref
feclk = 0 Hz
IN LPSTOP
SET STEXT = 0
fclkout
2 = 0 Hz
feclk = 0 Hz
IN LPSTOP
ENTER LPSTOP
NOTES:
1. THE SIMCLK IS USED BY THE PIT, IRQ, AND INPUT BLOCKS OF THE SIM.
2. CLKOUT CONTROL DURING LPSTOP IS OVERRIDDEN BY THE EXOFF BIT IN SIMCR. IF EXOFF = 1, THE CLKOUT
PIN IS ALWAYS IN A HIGH IMPEDANCE STATE AND STEXT HAS NO EFFECT IN LPSTOP. IF EXOFF = 0, CLKOUT
IS CONTROLLED BY STEXT IN LPSTOP.
SETUP INTERRUPT
TO WAKE UP MCU
FROM LPSTOP
LPSTOPFLOW
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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