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PIC18F8620-I/PT 参数 Datasheet PDF下载

PIC18F8620-I/PT图片预览
型号: PIC18F8620-I/PT
PDF下载: 下载PDF文件 查看货源
内容描述: 八十〇分之六十四引脚高性能1 Mbit的增强型闪存微控制器与A / D [64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D]
分类和应用: 闪存微控制器和处理器外围集成电路PC时钟
文件页数/大小: 366 页 / 6797 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18FXX20  
The WDT time-out period values may be found in the  
Electrical Specifications section under parameter #31.  
Values for the WDT postscaler may be assigned using  
the configuration bits.  
23.2 Watchdog Timer (WDT)  
The Watchdog Timer is a free running, on-chip RC  
oscillator, which does not require any external compo-  
nents. This RC oscillator is separate from the RC oscil-  
lator of the OSC1/CLKI pin. That means that the WDT  
will run, even if the clock on the OSC1/CLKI and  
OSC2/CLKO/RA6 pins of the device has been stopped,  
for example, by execution of a SLEEPinstruction.  
During normal operation, a WDT time-out generates a  
device RESET (Watchdog Timer Reset). If the device is  
in SLEEP mode, a WDT time-out causes the device to  
wake-up and continue with normal operation (Watch-  
dog Timer Wake-up). The TO bit in the RCON register  
will be cleared upon a WDT time-out.  
Note 1: The CLRWDT and SLEEP instructions  
clear the WDT and the postscaler, if  
assigned to the WDT and prevent it from  
timing out and generating  
RESET condition.  
a device  
2: When a CLRWDT instruction is executed  
and the postscaler is assigned to the  
WDT, the postscaler count will be cleared,  
but the postscaler assignment is not  
changed.  
The Watchdog Timer is enabled/disabled by a device  
configuration bit. If the WDT is enabled, software exe-  
cution may not disable this function. When the WDTEN  
configuration bit is cleared, the SWDTEN bit  
enables/disables the operation of the WDT.  
23.2.1  
CONTROL REGISTER  
Register 23-15 shows the WDTCON register. This is a  
readable and writable register, which contains a control  
bit that allows software to override the WDT enable  
configuration bit, only when the configuration bit has  
disabled the WDT.  
REGISTER 23-15: WDTCON REGISTER  
U-0  
bit 7  
U-0  
U-0  
U-0  
U-0  
U-0  
U-0  
R/W-0  
SWDTEN  
bit 0  
bit 7-1  
bit 0  
Unimplemented: Read as ‘0’  
SWDTEN: Software Controlled Watchdog Timer Enable bit  
1= Watchdog Timer is on  
0= Watchdog Timer is turned off if the WDTEN configuration bit in the Configuration  
register = 0  
Legend:  
R = Readable bit  
- n = Value at POR  
W = Writable bit  
‘1’ = Bit is set  
U = Unimplemented bit, read as ‘0’  
‘0’ = Bit is cleared x = Bit is unknown  
DS39609A-page 250  
Advance Information  
2003 Microchip Technology Inc.  
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