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型号： PIC17C766T-33E/PT
厂商： Microchip Technology
文件页数： 39/159页
文件大小： 0K
描述： IC MCU CMOS 33MHZ 16K EPRM80TQFP
标准包装： 1,200
系列： PIC® 17C
核心处理器： PIC
芯体尺寸： 8-位
速度： 33MHz
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： 66
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 16x10b
振荡器型： 外部
工作温度： -40°C ~ 125°C
封装/外壳： 80-TQFP
包装： 带卷 (TR)
配用： XLT80PT3-ND - SOCKET TRAN ICE 80MQFP/TQFP
AC174011-ND - MODULE SKT PROMATEII 80TQFP
2000 Microchip Technology Inc.
DS30289B-page 17
PIC17C7XX
4.0
ON-CHIP OSCILLATOR
CIRCUIT
The internal oscillator circuit is used to generate the
device clock. Four device clock periods generate an
internal instruction clock (TCY).
There are four modes that the oscillator can operate in.
They are selected by the device configuration bits dur-
ing device programming. These modes are:
LF
Low Frequency (FOSC
≤ 2 MHz)
XT
Standard Crystal/Resonator Frequency
(2 MHz
≤ FOSC ≤ 33 MHz)
EC
External Clock Input
(Default oscillator configuration)
RC
External Resistor/Capacitor
(FOSC
≤ 4 MHz)
There are two timers that offer necessary delays on
power-up. One is the Oscillator Start-up Timer (OST),
intended to keep the chip in RESET until the crystal
oscillator is stable. The other is the Power-up Timer
(PWRT), which provides a fixed delay of 96 ms (nomi-
nal) on POR and BOR. The PWRT is designed to keep
the part in RESET while the power supply stabilizes.
With these two timers on-chip, most applications need
no external RESET circuitry.
SLEEP mode is designed to offer a very low current
power-down mode. The user can wake from SLEEP
through external RESET, Watchdog Timer Reset, or
through an interrupt.
Several oscillator options are made available to allow
the part to better fit the application. The RC oscillator
option saves system cost while the LF crystal option
saves power. Configuration bits are used to select var-
ious options.
4.1
Oscillator Configurations
4.1.1
OSCILLATOR TYPES
The PIC17CXXX can be operated in four different oscil-
lator modes. The user can program two configuration
bits (FOSC1:FOSC0) to select one of these four
modes:
LF
Low Power Crystal
XT
Crystal/Resonator
EC
External Clock Input
RC
Resistor/Capacitor
The main difference between the LF and XT modes is
the gain of the internal inverter of the oscillator circuit,
which allows the different frequency ranges.
For more details on the device configuration bits, see
Section 17.0.
4.1.2
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
In XT or LF modes, a crystal or ceramic resonator is con-
nected to the OSC1/CLKIN and OSC2/CLKOUT pins to
establish oscillation (Figure 4-2). The PIC17CXXX oscil-
lator design requires the use of a parallel cut crystal. Use
of a series cut crystal may give a frequency out of the
crystal manufacturers specifications.
For frequencies above 24 MHz, it is common for the
crystal to be an overtone mode crystal. Use of overtone
mode crystals require a tank circuit to attenuate the
gain at the fundamental frequency. Figure 4-3 shows
an example circuit.
4.1.3
OSCILLATOR/RESONATOR
START-UP
As the device voltage increases from Vss, the oscillator
will start its oscillations. The time required for the oscil-
lator to start oscillating depends on many factors.
These include:
Crystal/resonator frequency
Capacitor values used (C1 and C2)
Device VDD rise time
System temperature
Series resistor value (and type) if used
Oscillator mode selection of device (which selects
the gain of the internal oscillator inverter)
Figure 4-1 shows an example of a typical oscillator/
resonator start-up. The peak-to-peak voltage of the
oscillator waveform can be quite low (less than 50% of
device VDD) when the waveform is centered at VDD/2
(refer to parameter #D033 and parameter #D043 in the
electrical specification section).
FIGURE 4-1:
OSCILLATOR/
RESONATOR START-UP
CHARACTERISTICS
V
DD
Crystal Start-up Time
Time
相关PDF资料
PDF描述
PIC17C766T-33E/L IC MCU CMOS 33MHZ 16K EPRM84PLCC
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PIC17C766T-16E/L IC MCU CMOS 16MHZ 16K EPRM84PLCC
PIC17C766-33E/PT IC MCU CMOS 33MHZ 16K EPRM80TQFP
PIC17C766-33E/L IC MCU CMOS 33MHZ 16K EPRM84PLCC
相关代理商/技术参数
参数描述
PIC17C766T-33I/L 功能描述:8位微控制器 -MCU 33MHz 16K EPRM 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
PIC17C766T-33I/PT 功能描述:8位微控制器 -MCU 32KB 902 RAM 66 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
PIC17LC42A-08/L 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 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
PIC17LC42A-08/P 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 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
PIC17LC42A-08/PQ 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 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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