參數(shù)資料
型號： PIC12F683T-E/SN
廠商： Microchip Technology
文件頁數(shù)： 102/176頁
文件大?。?/td> 0K
描述： IC MCU FLASH 2KX14 8SOIC
產(chǎn)品培訓模塊： Asynchronous Stimulus
Digi-Key 應用說明： AN0005 PWM Example with Microchip's CCP Module
AN0005 Example Code
標準包裝： 3,300
系列： PIC® 12F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 5
程序存儲器容量： 3.5KB（2K x 14）
程序存儲器類型： 閃存
EEPROM 大小： 256 x 8
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 4x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 125°C
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
包裝： 帶卷 (TR)
配用： AC162058-ND - HEADER MPLAB ICD2 FOR PIC12F683
I3-DB12F683-ND - BOARD DAUGHTER ICEPIC3
2007 Microchip Technology Inc.
DS41211D-page 29
PIC12F683
3.8
Fail-Safe Clock Monitor
The Fail-Safe Clock Monitor (FSCM) allows the device
to continue operating should the external oscillator fail.
The FSCM can detect oscillator failure any time after
the Oscillator Start-up Timer (OST) has expired. The
FSCM is enabled by setting the FCMEN bit in the
Configuration Word register (CONFIG). The FSCM is
applicable to all external oscillator modes (LP, XT, HS,
EC, RC and RCIO).
FIGURE 3-8:
FSCM BLOCK DIAGRAM
3.8.1
FAIL-SAFE DETECTION
The FSCM module detects a failed oscillator by
comparing the external oscillator to the FSCM sample
clock. The sample clock is generated by dividing the
LFINTOSC by 64. See Figure 3-8. Inside the fail
detector block is a latch. The external clock sets the
latch on each falling edge of the external clock. The
sample clock clears the latch on each rising edge of the
sample clock. A failure is detected when an entire
half-cycle of the sample clock elapses before the
primary clock goes low.
3.8.2
FAIL-SAFE OPERATION
When the external clock fails, the FSCM switches the
device clock to an internal clock source and sets the bit
flag OSFIF of the PIR1 register. Setting this flag will
generate an interrupt if the OSFIE bit of the PIE1
register is also set. The device firmware can then take
steps to mitigate the problems that may arise from a
failed clock. The system clock will continue to be
sourced from the internal clock source until the device
firmware successfully restarts the external oscillator
and switches back to external operation.
The internal clock source chosen by the FSCM is
determined by the IRCF<2:0> bits of the OSCCON
register. This allows the internal oscillator to be
configured before a failure occurs.
3.8.3
FAIL-SAFE CONDITION CLEARING
The Fail-Safe condition is cleared after a Reset,
executing a SLEEP instruction or toggling the SCS bit
of the OSCCON register. When the SCS bit is toggled,
the OST is restarted. While the OST is running, the
device continues to operate from the INTOSC selected
in OSCCON. When the OST times out, the Fail-Safe
condition is cleared and the device will be operating
from the external clock source. The Fail-Safe condition
must be cleared before the OSFIF flag can be cleared.
3.8.4
RESET OR WAKE-UP FROM SLEEP
The FSCM is designed to detect an oscillator failure
after the Oscillator Start-up Timer (OST) has expired.
The OST is used after waking up from Sleep and after
any type of Reset. The OST is not used with the EC or
RC Clock modes so that the FSCM will be active as
soon as the Reset or wake-up has completed. When
the FSCM is enabled, the Two-Speed Start-up is also
enabled. Therefore, the device will always be executing
code while the OST is operating.
External
LFINTOSC
÷ 64
S
R
Q
31 kHz
(~32
μs)
488 Hz
(~2 ms)
Clock Monitor
Latch
Clock
Failure
Detected
Oscillator
Clock
Q
Sample Clock
Note:
Due to the wide range of oscillator start-up
times, the Fail-Safe circuit is not active
during oscillator start-up (i.e., after exiting
Reset or Sleep). After an appropriate
amount of time, the user should check the
OSTS bit of the OSCCON register to verify
the oscillator start-up and that the system
clock
switchover
has
successfully
completed.
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相關代理商/技術參數(shù)
參數(shù)描述
PIC12F683T-I/MD 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6I/O 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
PIC12F683T-I/MDQTP 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PIC12F683T-I/MF 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6 I/O 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
PIC12F683T-I/MFQTP 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PIC12F683T-I/P 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
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