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| 型号： | PIC16F676-E/SL |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14 |
| 封装： | 3.90 MM, LEAD FREE, PLASTIC, SOIC-14 |
| 文件页数： | 90/132页 |
| 文件大小： | 1344K |
| 代理商： | PIC16F676-E/SL |
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PIC16F630/676
DS40039F-page 60
2010 Microchip Technology Inc.
9.3.1
MCLR
PIC16F630/676 devices have a noise filter in the
MCLR Reset path. The filter will detect and ignore
small pulses.
It should be noted that a WDT Reset does not drive
MCLR pin low.
The behavior of the ESD protection on the MCLR pin
has been altered from previous devices of this family.
Voltages applied to the pin that exceed its specification
can result in both MCLR Resets and excessive current
beyond the device specification during the ESD event.
For this reason, Microchip recommends that the MCLR
pin no longer be tied directly to VDD. The use of an RC
network, as shown in Figure 9-5, is suggested.
An internal MCLR option is enabled by setting the
MCLRE bit in the Configuration Word. When enabled,
MCLR is internally tied to VDD. No internal pull-up
option is available for the MCLR pin.
FIGURE 9-5:
RECOMMENDED MCLR
CIRCUIT
9.3.2
POWER-ON RESET (POR)
The on-chip POR circuit holds the chip in Reset until
VDD has reached a high enough level for proper
operation. To take advantage of the POR, simply tie the
MCLR pin through a resistor to VDD. This will eliminate
external RC components usually needed to create
Power-on Reset. A maximum rise time for VDD is
required. See Section 12.0 “Electrical Specifica-
tions” for details. If the BOD is enabled, the maximum
rise time specification does not apply. The BOD cir-
cuitry will keep the device in Reset until VDD reaches
VBOD
(see
(BOD)”).
When the device starts normal operation (exits the
Reset condition), device operating parameters (i.e.,
voltage, frequency, temperature, etc.) must be met 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.”
9.3.3
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms (nominal)
time-out on power-up only, from POR or Brown-out
Detect. The Power-up Timer operates on an internal
RC oscillator. The chip is kept in Reset as long as
PWRT is active. The PWRT delay allows the VDD to
rise to an acceptable level. A Configuration bit, PWRTE
can disable (if set) or enable (if cleared or
programmed) the Power-up Timer. The Power-up
Timer should always be enabled when Brown-out
Detect is enabled.
The Power-up Time delay will vary from chip to chip
and due to:
VDD variation
Temperature variation
Process variation.
See DC parameters for details (Section 12.0 “Electri-
9.3.4
OSCILLATOR START-UP TIMER
(OST)
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over. This ensures that the crystal
oscillator or resonator has started and stabilized.
The OST time-out is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
Sleep.
Note:
The POR circuit does not produce an inter-
nal Reset when VDD declines.
VDD
PIC16F630/676
MCLR
R1
1 k
or greater
C1
0.1
f
(optional, not critical)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC16F676-I/ML | 功能描述:8位微控制器 -MCU 1.75 KB 64 RAM 12I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F676-I/P | 功能描述:8位微控制器 -MCU 1.75KB 64 RAM 12 I/O Ind Temp PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F676-I/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F676 DIP14 |
| PIC16F676-I/SL | 功能描述:8位微控制器 -MCU 1.75KB 64 RAM 12 I/O Ind Temp SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F676-I/SL | 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F676 SOIC14 |
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