參數(shù)資料
型號: PIC16F716-I/P
廠商: Microchip Technology
文件頁數(shù): 111/136頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 2KX14 18DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 25
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 18-DIP(0.300",7.62mm)
包裝: 管件
產(chǎn)品目錄頁面: 639 (CN2011-ZH PDF)
配用: I3-DB16F716-ND - BOARD DAUGHTER ICEPIC3
AC162054-ND - HEADER INTERFACE ICD2 16F716
ACICE0202-ND - ADAPTER MPLABICE 18P 300 MIL
AC164010-ND - MODULE SKT PROMATEII DIP/SOIC
PIC16F716
DS41206B-page 74
2007 Microchip Technology Inc.
9.12
Watchdog Timer (WDT)
The Watchdog Timer is a free running, on-chip, RC
oscillator which does not require any external
components. 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 have 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 (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
Configuration bit WDTE (Section 9.1 “Configuration
WDT time-out period values may be found in the
Electrical Specifications section under TWDT (parameter
#31). Values for the WDT prescaler (actually a
postscaler, but shared with the Timer0 prescaler) may be
assigned using the OPTION register.
.
FIGURE 9-14:
WATCHDOG TIMER BLOCK DIAGRAM
TABLE 9-7:
SUMMARY OF REGISTERS ASSOCIATED WITH WATCHDOG TIMER
Note:
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.
Note:
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.
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets
CONFIG1(1)
BORV
BOREN
PWRTE
WDTE
FOSC1
FOSC0
OPTION_REG
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
Legend:
x
= unknown, u = unchanged, - = unimplemented locations read as ‘0’. Shaded cells are not used the Watchdog Timer.
Note
1:
See Configuration Word Register (Register 9-1) for operation of all register bits.
From TMR0 Clock Source (Figure 4-1)
To TMR0 (Figure 4-1)
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
8
Note:
PSA and PS2:PS0 are bits in the OPTION register.
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