參數(shù)資料
型號: PIC16CR76
廠商: Microchip Technology Inc.
英文描述: 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述: 28/40-Pin,8位微控制器的CMOS光盤
文件頁數(shù): 103/172頁
文件大?。?/td> 1506K
代理商: PIC16CR76
2007 Microchip Technology Inc.
DS21993C-page 101
PIC16CR7X
12.13 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
oscillator of the OSC1/CLKIN pin. That means that the
WDT will run, even if the clock on the OSC1/CLKIN and
OSC2/CLKOUT pins of the device has been stopped,
for example, by execution of a
SLEEP
instruction.
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 STATUS regis-
ter will be cleared upon a Watchdog Timer time-out.
The WDT can be permanently disabled by clearing
Configuration bit, WDTE (
Section 12.1 “Configuration
Bits”
).
WDT time-out period values may be found in the
Electrical Specifications section under parameter #31.
Values for the WDT prescaler (actually a postscaler, but
shared with the Timer0 prescaler), may be assigned
using the OPTION_REG register.
FIGURE 12-11:
WATCHDOG TIMER BLOCK DIAGRAM
TABLE 12-7:
SUMMARY OF WATCHDOG TIMER REGISTERS
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 a device Reset
condition.
2:
When a
CLRWDT
instruction is executed
and the prescaler is assigned to the WDT,
the prescaler count will be cleared, but
the prescaler assignment is not changed.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
2007h
81h,181h
Legend:
Note 1:
See Register 12-1 for operation of these bits.
Config. bits
OPTION_REG
Shaded cells are not used by the Watchdog Timer.
(1)
BOREN
(1)
INTEDG
CP0
T0SE
PWRTEN
(1)
PSA
WDTEN
PS2
FOSC1
PS1
FOSC0
PS0
RBPU
T0CS
From TMR0 Clock Source
(Figure 5-1)
To TMR0 (Figure 5-1)
Postscaler
WDT Timer
WDT
Enable Bit
0
1
M
U
X
PSA
8-to-1 MUX
PS2:PS0
0
1
MUX
PSA
WDT
Time-out
Note:
PSA and PS2:PS0 are bits in the OPTION_REG register.
8
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