參數(shù)資料
型號： PIC16F785
廠商： Microchip Technology Inc.
英文描述： 20-Pin Flash-Based 8-Bit CMOS Microcontroller with Two-Phase Asychronous Feedback PWM, Dual High-Speed Comparators and Dual Operational Amplifiers
中文描述： 20引腳基于閃存的8兩相異步反饋的PWM，雙高位CMOS微控制器的高速比較器和雙運算放大器
文件頁數(shù)： 109/178頁
文件大?。?/td> 1620K
代理商： PIC16F785
2004 Microchip Technology Inc.
Preliminary
DS41249A-page 107
PIC16F785
15.3.4
BROWN-OUT RESET (BOR)
The BOREN0 and BOREN1 bits in the Configuration
Word select one of four BOR modes. Two modes have
been added to allow software or hardware control of
the BOR enable. When BOREN<1:0> =
01
, the
SBOREN bit (PCON<4>) enables/disables the BOR
allowing it to be controlled in software. By selecting
BOREN<1:0>, the BOR is automatically disabled in
Sleep to conserve power and enabled on wake-up. In
this mode, the SBOREN bit is disabled. See
Register 15-1 for the Configuration Word definition.
If V
DD
falls below V
BOR
for greater than parameter
(T
BOR
), see
Section 18.0 “Electrical Specifica-
tions”
, the Brown-out situation will reset the device.
This will occur regardless of V
DD
slew rate. A Reset is
not assured if V
DD
falls below V
BOR
for less than
parameter (T
BOR
).
On any Reset (Power-on, Brown-out Reset, Watchdog,
etc.), the chip will remain in Reset until V
DD
rises above
V
BOR
(see Figure 15-3). The Power-up Timer will now
be invoked, if enabled, and will keep the chip in Reset
an additional 64 ms.
If V
DD
drops below V
BOR
while the Power-up Timer is
running, the chip will go back into a Brown-out Reset
and the Power-up Timer will be re-initialized. Once V
DD
rises above V
BOR
, the Power-up Timer will execute a
64 ms Reset.
15.3.5
BOR CALIBRATION
The PIC16F785 stores the BOR calibration values in
fuses located in the Calibration Word (2008h). The
Calibration Word is not erased when using the speci-
fied bulk erase sequence in the PIC16F785 Memory
Programming Specification(DS41237) and thus, does
not require reprogramming.
FIGURE 15-3:
BROWN-OUT SITUATIONS
Note:
The Power-up Timer is enabled by the
PWRTE bit in the Configuration Word.
Note:
Address 2008h is beyond the user program
memory space. It belongs to the special
configuration memory space (2000h –
3FFFh), which can be accessed only during
programming. See PIC16F785 Memory
Programming Specification (DS41237) for
more information.
64 ms
(1)
V
BOR
V
DD
Internal
Reset
V
BOR
V
DD
Internal
Reset
64 ms
(1)
<64 ms
64 ms
(1)
V
BOR
V
DD
Internal
Reset
Note 1:
64 ms delay only if PWRTE bit is programmed to ‘
0
’.
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相關代理商/技術參數(shù)
參數(shù)描述
PIC16F785-E/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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
PIC16F785-E/P 功能描述:8位微控制器 -MCU 14KB 368 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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
PIC16F785-E/SO 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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
PIC16F785-E/SS 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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
PIC16F785-I/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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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