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参数资料
型号： PIC17C756AT-16E/L
厂商： Microchip Technology
文件页数： 78/159页
文件大小： 0K
描述： IC MCU CMOS 16MHZ 16K EPRM68PLCC
标准包装： 300
系列： PIC® 17C
核心处理器： PIC
芯体尺寸： 8-位
速度： 16MHz
连通性： I²C，SPI，UART/USART
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 50
程序存储器容量： 32KB（16K x 16）
程序存储器类型： OTP
RAM 容量： 902 x 8
电压 - 电源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
数据转换器： A/D 12x10b
振荡器型： 外部
工作温度： -40°C ~ 125°C
封装/外壳： 68-LCC（J 形引线）
包装： 带卷 (TR)
配用： AC164308-ND - MODULE SKT FOR PM3 68PLCC
DVA17XL681-ND - DEVICE ADAPTER FOR PIC17C752
DM173001-ND - KIT DEVELOPMENT PICDEM17
AC174007-ND - MODULE SKT PROMATEII 68PLCC
AC164024-ND - ADAPTER PICSTART PLUS 68PLCC
PIC17C7XX
DS30289B-page 24
2000 Microchip Technology Inc.
5.1
Power-on Reset (POR), Power-up
Timer (PWRT), Oscillator Start-up
Timer (OST) and Brown-out Reset
(BOR)
5.1.1
POWER-ON RESET (POR)
The Power-on Reset circuit holds the device in RESET
until VDD is above the trip point (in the range of 1.4V -
2.3V). The devices produce an internal RESET for both
rising and falling VDD. To take advantage of the POR,
just tie the MCLR/VPP pin directly (or through a resistor)
to VDD. This will eliminate external RC components
usually needed to create Power-on Reset. A minimum
rise time for VDD is required. See Electrical Specifica-
tions for details.
Figure 5-2 and Figure 5-3 show two possible POR
circuits.
FIGURE 5-2:
USING ON-CHIP POR
FIGURE 5-3:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW VDD POWER-UP)
5.1.2
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 96 ms time-out
(nominal) on power-up. This occurs from the rising
edge of the internal POR signal if VDD and MCLR are
tied, or after the first rising edge of MCLR (detected
high). The Power-up Timer operates on an internal RC
oscillator. The chip is kept in RESET as long as the
PWRT is active. In most cases, the PWRT delay allows
VDD to rise to an acceptable level.
The power-up time delay will vary from chip to chip and
with VDD and temperature. See DC parameters for
details.
5.1.3
OSCILLATOR START-UP TIMER
(OST)
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle (1024TOSC) delay whenever the PWRT
is invoked, or a wake-up from SLEEP event occurs in XT
or LF mode. The PWRT and OST operate in parallel.
The OST counts the oscillator pulses on the OSC1/
CLKIN pin. The counter only starts incrementing after
the amplitude of the signal reaches the oscillator input
thresholds. This delay allows the crystal oscillator or
resonator to stabilize before the device exits RESET.
The length of the time-out is a function of the crystal/
resonator frequency.
Figure 5-4 shows the operation of the OST circuit. In
this figure, the oscillator is of such a low frequency that
although enabled simultaneously, the OST does not
time-out until after the Power-up Timer time-out.
FIGURE 5-4:
OSCILLATOR START-UP
TIME(LOWFREQUENCY)
VDD
MCLR
PIC17CXXX
VDD
Note
1:
An external Power-on Reset circuit is
required only if VDD power-up time is too
slow. The diode D helps discharge the capac-
itor quickly when VDD powers down.
2: R < 40 k
is recommended to ensure that the
voltage drop across R does not exceed 0.2V
(max. leakage current spec. on the MCLR/
VPP pin is 5
A). A larger voltage drop will
degrade VIH level on the MCLR/VPP pin.
3: R1 = 100
to 1 k will limit any current flow-
ing into MCLR from external capacitor C in
the event of MCLR/VPP pin breakdown due to
Electrostatic Discharge (ESD) or Electrical
Overstress (EOS).
C
R1
R
D
VDD
MCLR
PIC17CXXX
VDD
MCLR
OSC2
OST TIME_OUT
PWRT TIME_OUT
INTERNAL RESET
TOSC1
TOST
TPWRT
POR or BOR Trip Point
This figure shows in greater detail the timings involved
with the oscillator start-up timer. In this example, the low
frequency crystal start-up time is larger than power-up
time (TPWRT).
TOSC1 = time for the crystal oscillator to react to an oscil-
lation level detectable by the Oscillator Start-up Timer
(OST).
TOST = 1024TOSC.
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相关代理商/技术参数
参数描述
PIC17C756AT-16I/L 功能描述:8位微控制器 -MCU 32KB 902 RAM 50 I/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
PIC17C756AT-16I/PT 功能描述:8位微控制器 -MCU 32KB 902 RAM 50 I/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
PIC17C756AT-33/L 功能描述:8位微控制器 -MCU 32KB 902 RAM 50 I/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
PIC17C756AT-33/PT 功能描述:8位微控制器 -MCU 32KB 902 RAM 50 I/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
PIC17C756AT-33E/L 功能描述:8位微控制器 -MCU 32KB 902 RAM 50 I/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
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