參數(shù)資料
型號： PIC16F83
廠商： Microchip Technology Inc.
英文描述： 8-Bit CMOS Flash/EEPROM Microcontollrs(每個I/O口有20mA吸收,25mA驅(qū)動，64字節(jié)數(shù)據(jù)EEPROM，2.0V的微控制器)
中文描述： 8位CMOS閃存/ EEPROM Microcontollrs（每個的I / O口有20mA的吸收，25mA電流驅(qū)動，64字節(jié)數(shù)據(jù)的EEPROM，2.0伏的微控制器）
文件頁數(shù)： 47/120頁
文件大?。?/td> 764K
代理商： PIC16F83
1996 Microchip Technology Inc.
DS30430A-page 47
PIC16F8X
8.7
Time-out Sequence and Power-down
Status Bits (TO/PD)
On power-up (Figure 8-10, Figure 8-11, Figure 8-12
and Figure 8-13) the time-out sequence is as follows:
First PWRT time-out is invoked after a POR has
expired. Then the OST is activated. The total time-out
will vary based on oscillator configuration and PWRTE
configuration bit status. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
TABLE 8-5:
TIME-OUT IN VARIOUS
SITUATIONS
Since the time-outs occur from the POR reset pulse, if
MCLR is kept low long enough, the time-outs will
expire. Then bringing MCLR high, execution will begin
immediately (Figure 8-10). This is useful for testing
purposes or to synchronize more than one PIC16F8X
device when operating in parallel.
Table 8-6 shows the significance of the TO and PD bits.
Table 8-3 lists the reset conditions for some special
registers, while Table 8-4 lists the reset conditions for
all the registers.
TABLE 8-6:
STATUS BITS AND THEIR
SIGNIFICANCE
Oscillator
Configuration
Power-up
Wake-up
from
SLEEP
PWRT
Enabled
72 ms +
1024T
OSC
72 ms
PWRT
Disabled
1024T
OSC
XT, HS, LP
1024T
OSC
RC
—
—
TO
PD
Condition
1
0
x
0
0
1
1
1
x
0
1
0
1
0
Power-on Reset
Illegal, TO is set on POR
Illegal, PD is set on POR
WDT Reset (during normal operation)
WDT Wake-up
MCLR Reset during normal operation
MCLR Reset during SLEEP or interrupt
wake-up from SLEEP
8.8
Reset on Brown-Out
A brown-out is a condition where device power (V
DD
)
dips below its minimum value, but not to zero, and
then recovers. The device should be reset in the event
of a brown-out.
To reset a PIC16F8X device when a brown-out occurs,
external brown-out protection circuits may be built, as
shown in Figure 8-14 and Figure 8-15.
FIGURE 8-14: BROWN-OUT PROTECTION
CIRCUIT 1
FIGURE 8-15: BROWN-OUT PROTECTION
CIRCUIT 2
V
DD
This circuit will activate reset when V
DD
goes below
(Vz + 0.7V) where Vz = Zener voltage.
V
DD
33k
10k
40k
V
DD
MCLR
PIC16F8X
This brown-out circuit is less expensive, although less
accurate. Transistor Q1 turns off when V
DD
is below a
certain level such that:
V
DD
R1
R1 + R2
= 0.7V
R2
40k
V
DD
MCLR
PIC16F8X
R1
Q1
相關(guān)PDF資料
PDF描述
PIC16F84 18-pin Flash/EEPROM 8-Bit Microcontrollers
PIC16F85 18/20 Pin, 8-Bit CMOS FLASH Microcontroller with Comparators and A/D Product Brief
PIC16F86 18/20 Pin, 8-Bit CMOS FLASH Microcontroller with Comparators and A/D Product Brief
PIC16F873A 28/40-pin Enhanced FLASH Microcontrollers
PIC16F874A 28/40-pin Enhanced FLASH Microcontrollers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F83-04/P 功能描述:8位微控制器 -MCU .875KB 36 RAM 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(fēng)格:SMD/SMT
PIC16F83-04/P 制造商:Microchip Technology Inc 功能描述:IC 8-BIT FLASH MCU
PIC16F83-04/SO 功能描述:8位微控制器 -MCU .875KB 36 RAM 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(fēng)格:SMD/SMT
PIC16F83-04I/P 功能描述:8位微控制器 -MCU .875KB 36 RAM 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(fēng)格:SMD/SMT
PIC16F83-04I/SO 功能描述:8位微控制器 -MCU .875KB 36 RAM 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(fēng)格:SMD/SMT
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