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參數(shù)資料
| 型號： | PIC16LC433E/P |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件頁數(shù)： | 83/122頁 |
| 文件大?。?/td> | 1862K |
| 代理商： | PIC16LC433E/P |
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2001 Microchip Technology Inc.
Advance Information
DS41139A-page 61
PIC16C433
9.7
Watchdog Timer (WDT)
The Watchdog Timer is a free running, on-chip RC oscil-
lator, 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/CLK-
OUT pins of the device has been stopped, for example,
by execution of a SLEEP instruction. During normal oper-
ation, 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 WDT can be permanently disabled by
clearing configuration bit WDTE (Section 9.1).
9.7.1
WDT PERIOD
The WDT has a nominal time-out period of 18 ms (with
no prescaler). The time-out periods vary with tempera-
ture, VDD and process variations from part to part (see
DC specs). If longer time-out periods are desired, a
prescaler with a division ratio of up to 1:128 can be
assigned to the WDT under software control, by writing
to the OPTION register. Thus, time-out periods up to
2.3 seconds can be realized.
The CLRWDT and SLEEP instructions clear the WDT
and the postscaler, if assigned to the WDT, and prevent
it from timing out early and generating a premature
device RESET condition.
The TO bit in the STATUS register will be cleared upon
a Watchdog Timer time-out.
9.7.2
WDT PROGRAMMING CONSIDERATIONS
It should also be taken into account that under worst
case conditions (VDD = Min., Temperature = Max., and
Max. WDT prescaler), it may take several seconds
before a WDT time-out occurs.
See Example 7-1 and Example 7-2 for changing pres-
caler between WDT and Timer0.
FIGURE 9-16: WATCHDOG TIMER BLOCK DIAGRAM
TABLE 9-8:
SUMMARY OF WATCHDOG TIMER REGISTERS
Note:
When the prescaler is assigned to the
WDT, always execute a CLRWDT instruc-
tion before changing the prescale value,
otherwise a WDT Reset may occur.
From TMR0 Clock Source
To TMR0 (Figure 7-5)
Postscaler
WDT Timer
WDT
Enable Bit
0
1
M
U
X
PSA
8 - to - 1 MUX
0
1
MUX
PSA
WDT
Time-out
Note: PSA and PS<2:0> are bits in the OPTION register.
8
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
2007h
Config. bits(1)
MCLRE
CP1
CP0
PWRTE
WDTE
FOSC2
FOSC1
FOSC0
81h
OPTION
GPPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 9-1 for operation of these bits. Not all CP0 and CP1 bits are shown.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16LC433-I/P | 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| PIC16LC433-I/SO | 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| PIC16LC433T-I/SO | 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| PIC16LC505-04/P | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| PIC16LC505-04/SL | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
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