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| 型號(hào)： | PIC16F84 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 18-pin Flash/EEPROM 8-Bit Microcontrollers |
| 中文描述： | 18引腳閃存/ EEPROM的8位微控制器 |
| 文件頁(yè)數(shù)： | 44/124頁(yè) |
| 文件大?。?/td> | 1060K |
| 代理商： | PIC16F84 |
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PIC16F8X
DS30430C-page 44
1998 Microchip Technology Inc.
8.4
Power-on Reset (POR)
A Power-on Reset pulse is generated on-chip when
V
DD
rise is detected (in the range of 1.2V - 1.7V). To
take advantage of the POR, just tie the MCLR pin
directly (or through a resistor) to V
DD
. This will
eliminate external RC components usually needed to
create Power-on Reset. A minimum rise time for V
DD
must be met for this to operate properly. See Electrical
Specifications for details.
When the device starts normal operation (exits the
reset condition), device operating parameters (voltage,
frequency, temperature, ...) must be meet to ensure
operation. If these conditions are not met, the device
must be held in reset until the operating conditions
are met.
For additional information, refer to Application Note
AN607, "Power-up Trouble Shooting"
The POR circuit does not produce an internal reset
when V
DD
declines.
8.5
Power-up Timer (PWRT)
The Power-up Timer (PWRT) provides a fixed 72 ms
nominal time-out (T
PWRT
) from POR (Figure 8-10,
Figure 8-11, Figure 8-12 and Figure 8-13). The
Power-up Timer operates on an internal RC oscillator.
The chip is kept in reset as long as the PWRT is active.
The PWRT delay allows the V
DD
to rise to an accept-
able level (Possible exception shown in Figure 8-13).
A configuration bit, PWRTE, can enable/disable the
PWRT. See either Figure 8-1 or Figure 8-2 for the oper-
ation of the PWRTE bit for a particular device.
The power-up time delay T
PWRT
will vary from chip to
chip due to V
DD
, temperature, and process variation.
See DC parameters for details.
8.6
Oscillator Start-up Timer (OST)
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle delay (from OSC1 input) after the
PWRT
delay
ends
(Figure 8-10,
Figure 8-12 and Figure 8-13). This ensures the crystal
oscillator or resonator has started and stabilized.
The OST time-out (T
OST
) is invoked only for XT, LP and
HS modes and only on Power-on Reset or wake-up
from SLEEP.
When V
DD
rises very slowly, it is possible that the
T
PWRT
time-out and T
OST
time-out will expire before
V
DD
has reached its final value. In this case
(Figure 8-13), an external power-on reset circuit may
be necessary (Figure 8-9).
Figure 8-11,
FIGURE 8-9:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR SLOW
V
DD
POWER-UP)
Note 1: External Power-on Reset circuit is required
only if V
DD
power-up rate is too slow. The
diode D helps discharge the capacitor
quickly when V
DD
powers down.
2: R < 40 k
is recommended to make sure
that voltage drop across R does not exceed
0.2V (max leakage current spec on MCLR
pin is 5
μ
A). A larger voltage drop will
degrade V
IH
level on the MCLR pin.
3: R1 = 100
to 1 k
will limit any current
flowing into MCLR from external
capacitor C in the event of an MCLR pin
breakdown due to ESD or EOS.
C
R1
R
D
V
DD
MCLR
PIC16FXX
V
DD
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16F84-04/P | 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 4MHz PDIP18 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| PIC16F84-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8-BIT FLASH MCU |
| PIC16F84-04/SO | 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 4MHz SOIC18 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| PIC16F84-04/SO | 制造商:Microchip Technology Inc 功能描述:IC SM 8-BIT FLASH MCU |
| PIC16F84-04I/P | 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 4MHz Ind Temp PDIP18 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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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