参数资料
型号: PIC16LF818T-I/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 10 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数: 3/176页
文件大小: 3124K
代理商: PIC16LF818T-I/SS
PIC16F818/819
DS39598E-page 98
2004 Microchip Technology Inc.
12.12 Watchdog Timer (WDT)
For PIC16F818/819 devices, the WDT is driven by the
INTRC oscillator. When the WDT is enabled, the
INTRC (31.25 kHz) oscillator is enabled. The nominal
WDT period is 16 ms and has the same accuracy as
the INTRC oscillator.
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 (Watchdog
Timer wake-up). The TO bit in the Status register will be
cleared upon a Watchdog Timer time-out.
The WDT can be permanently disabled by clearing con-
figuration bit, WDTEN (see Section 12.1 “Configuration
WDT time-out period values may be found in
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 12-8:
WATCHDOG TIMER BLOCK DIAGRAM
TABLE 12-5:
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.
From TMR0 Clock Source
To TMR0 (Figure 6-1)
Postscaler
INTRC
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
31.25 kHz
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
81h,181h OPTION_REG
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
2007h
Configuration bits(1)
LVP
BOREN
MCLRE
FOSC2
PWRTEN
WDTEN
FOSC1
FOSC0
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1:
See Register 12-1 for operation of these bits.
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