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SN8F2250B 参数 Datasheet PDF下载

SN8F2250B图片预览
型号: SN8F2250B
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器 [8-Bit Micro-Controller]
分类和应用: 微控制器
文件页数/大小: 133 页 / 1554 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
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SN8F2250B Series  
USB 2.0 Full-Speed 8-Bit Micro-Controller  
8
TIMERS  
8.1 WATCHDOG TIMER  
The watchdog timer (WDT) is a binary up counter designed for monitoring program execution. If the program goes into  
the unknown status by noise interference, WDT overflow signal raises and resets MCU. Watchdog clock controlled by  
code option and the clock source is internal low-speed oscillator (24KHz).  
Watchdog overflow time = 8192 / Internal Low-Speed oscillator (sec).  
VDD  
Internal Low RC Freq.  
Watchdog Overflow Time  
5V  
24KHz  
341ms  
’
Note: If watchdog is “Always_On” mode, it keeps running event under power down mode or green  
mode.  
Watchdog clear is controlled by WDTR register. Moving 0x5A data into WDTR is to reset watchdog timer.  
0CCH  
WDTR  
Read/Write  
After reset  
Bit 7  
WDTR7  
W
Bit 6  
WDTR6  
W
Bit 5  
WDTR5  
W
Bit 4  
WDTR4  
W
Bit 3  
WDTR3  
W
Bit 2  
WDTR2  
W
Bit 1  
WDTR1  
W
Bit 0  
WDTR0  
W
0
0
0
0
0
0
0
0
Example: An operation of watchdog timer is as following. To clear the watchdog timer counter in the top of the  
main routine of the program.  
Main:  
MOV  
B0MOV  
A,#5AH  
WDTR,A  
; Clear the watchdog timer.  
CALL  
CALL  
SUB1  
SUB2  
JMP  
MAIN  
SONiX TECHNOLOGY CO., LTD  
Page 74  
Version 1.1  
 
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