參數(shù)資料
型號: 35007B
廠商: Microchip Technology Inc.
英文描述: 18-pin Enhanced FLASH/EEPROM 8-bit Microcontroller
中文描述: 18針/ EEPROM的8位微控制器的閃存
文件頁數(shù): 33/88頁
文件大?。?/td> 1495K
代理商: 35007B
2001 Microchip Technology Inc.
DS35007B-page 31
PIC16F84A
6.10.2
WDT PROGRAMMING
CONSIDERATIONS
It should also be taken into account that under worst
case conditions (V
DD
= Min., Temperature = Max., Max.
WDT Prescaler), it may take several seconds before a
WDT time-out occurs.
FIGURE 6-11:
WATCHDOG TIMER BLOCK DIAGRAM
TABLE 6-7:
SUMMARY OF REGISTERS ASSOCIATED WITH THE WATCHDOG TIMER
From TMR0 Clock Source
(Figure 5-2)
To TMR0 (Figure 5-2)
Postscaler
WDT Timer
M
U
X
PSA
8 - to -1 MUX
PSA
WDT
Time-out
1
0
0
1
WDT
Enable Bit
PS2:PS0
8
MUX
Note:
PSA and PS2:PS0 are bits in the OPTION_REG register.
Addr
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on all
other
RESETS
2007h
81h
Legend:
x
= unknown. Shaded cells are not used by the WDT.
Note
1:
See Register 6-1 for operation of the PWRTE bit.
2:
See Register 6-1 and Section 6.12 for operation of the code and data protection bits.
Config. bits
OPTION_REG
(2)
(2)
(2)
(2)
PWRTE
(1)
PSA
WDTE
PS2
FOSC1
PS1
FOSC0
PS0
(2)
RBPU
INTEDG
T0CS
T0SE
1111 1111 1111 1111
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