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參數(shù)資料
| 型號： | PIC16C712T |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Bit CMOS Microcontrollers with A/D Converter and Capture/Compare/PWM |
| 中文描述： | 8位CMOS微控制器與A / D轉換器和捕捉/比較/ PWM |
| 文件頁數(shù)： | 57/108頁 |
| 文件大小： | 1810K |
| 代理商： | PIC16C712T |
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1999 Microchip Technology Inc.
Preliminary
DS41106A-page 57
PIC16C712/716
FIGURE 9-8:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 9-9:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
Note1:
This circuit will activate reset when V
DD
goes below (Vz + 0.7V) where
Vz = Zener voltage.
2:
Internal Brown-out Reset circuitry
should be disabled when using this cir-
cuit.
V
DD
33k
10k
40k
V
DD
MCLR
PIC16C7XX
Q1
Note1:
This brown-out circuit is less expensive,
albeit less accurate. Transistor Q1 turns
off when V
DD
is below a certain level
such that:
2:
Internal brown-out reset should be dis-
abled when using this circuit.
3:
Resistors should be adjusted for the
characteristics of the transistor.
V
DD
x
R1
R1 + R2
= 0.7 V
V
DD
R2
40k
V
DD
MCLR
PIC16C7XX
R1
Q1
FIGURE 9-10: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 3
9.8
Time-out Sequence
On power-up the time-out sequence is as follows: First
PWRT time-out is invoked after the POR time delay has
expired. Then OST is activated. The total time-out will
vary based on oscillator configuration and the status of
the PWRT. For example, in RC mode with the PWRT
disabled, there will be no time-out at all. Figure 9-11,
Figure 9-12,
and
Figure 9-13
sequences on power-up.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, the time-outs will expire. Then
bringing MCLR high will begin execution immediately
(Figure 9-13). This is useful for testing purposes or to
synchronize more than one PIC16CXXX device operat-
ing in parallel.
Table 9-5 shows the reset conditions for some special
function registers, while Table 9-6 shows the reset con-
ditions for all the registers.
depict
time-out
9.9
Power Control/Status Register
(PCON)
The Power Control/Status Register, PCON has two
bits.
Bit0 is Brown-out Reset Status bit, BOR. If the BODEN
configuration bit is set, BOR
is ’1’ on Power-on Reset.
If the BODEN configuration bit is clear, BOR is
unknown on Power-on Reset.
The BOR status bit is a "don't care" and is not neces-
sarily predictable if the brown-out circuit is disabled (the
BODEN configuration bit is clear). BOR must then be
set by the user and checked on subsequent resets to
see if it is clear, indicating a brown-out has occurred.
Bit1 is POR (Power-on Reset Status bit). It is cleared on
a Power-on Reset and unaffected otherwise. The user
must set this bit following a Power-on Reset.
This brown-out protection circuit employs
Microchip Technology’s MCP809 microcontroller
supervisor. The MCP8XX and MCP1XX families
of supervisors provide push-pull and open
collector outputs with both high and low active
reset pins. There are 7 different trip point
selections to accommodate 5V and 3V systems
MCLR
PIC16C7XX
V
DD
V
DD
Vss
RST
MCP809
V
DD
bypass
capacitor
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16C712T-04/SO | 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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 |
| PIC16C712T-04/SS | 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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 |
| PIC16C712T-04E/SO | 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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 |
| PIC16C712T-04E/SS | 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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 |
| PIC16C712T-04I/SO | 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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 |
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