参数资料
型号: PIC16F716-E/SO
厂商: Microchip Technology
文件页数: 111/136页
文件大小: 0K
描述: IC PIC MCU FLASH 2KX14 18SOIC
产品培训模块: Asynchronous Stimulus
标准包装: 42
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 13
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 4x8b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 18-SOIC(0.295",7.50mm 宽)
包装: 管件
配用: I3-DB16F716-ND - BOARD DAUGHTER ICEPIC3
AC162054-ND - HEADER INTERFACE ICD2 16F716
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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