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| 型号： | PIC16LF1527T-I/MR |
| 厂商： | Microchip Technology |
| 文件页数： | 85/94页 |
| 文件大小： | 0K |
| 描述： | MCU PIC 28KB FLASH 64QFN |
| 标准包装： | 3,300 |
| 系列： | PIC® XLP™ 16F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 连通性： | I²C，LIN，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 54 |
| 程序存储器容量： | 28KB（16K x 14） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 1.5K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 1.8 V ~ 3.6 V |
| 数据转换器： | A/D 30x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 64-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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2011 Microchip Technology Inc.
Preliminary
DS41458B-page 51
PIC16(L)F1526/27
5.0
OSCILLATOR MODULE (WITH
FAIL-SAFE CLOCK MONITOR)
5.1
Overview
The oscillator module has a wide variety of clock
sources and selection features that allow it to be used
in a wide range of applications while maximizing perfor-
mance and minimizing power consumption. Figure 5-1
illustrates a block diagram of the oscillator module.
Clock sources can be supplied from external oscillators,
quartz crystal resonators, ceramic resonators and
Resistor-Capacitor (RC) circuits. In addition, the system
clock source can be supplied from one of two internal
oscillators, with a choice of speeds selectable via
software. Additional clock features include:
Selectable system clock source between external
or internal sources via software.
Two-Speed Start-up mode, which minimizes
latency between external oscillator start-up and
code execution.
Fail-Safe Clock Monitor (FSCM) designed to
detect a failure of the external clock source (LP,
XT, HS, EC or RC modes) and switch
automatically to the internal oscillator.
Oscillator Start-up Timer (OST) ensures stability
of crystal oscillator sources
Fast start-up oscillator allows internal circuits to
power up and stabilize before switching to the 16
MHz HFINTOSC
The oscillator module can be configured in one of eight
clock modes.
1.
ECL – External Clock Low Power mode
(0 MHz to 0.5 MHz)
2.
ECM – External Clock Medium Power mode
(0.5 MHz to 4 MHz)
3.
ECH – External Clock High Power mode
(4 MHz to 20 MHz)
4.
LP – 32 kHz Low-Power Crystal mode.
5.
XT – Medium Gain Crystal or Ceramic Resonator
Oscillator mode (up to 4 MHz)
6.
HS – High Gain Crystal or Ceramic Resonator
mode (4 MHz to 20 MHz)
7.
RC – External Resistor-Capacitor (RC).
8.
INTOSC – Internal oscillator (31 kHz to 16 MHz).
Clock Source modes are selected by the FOSC<2:0>
bits in the Configuration Word 1. The FOSC bits
determine the type of oscillator that will be used when
the device is first powered.
The EC Clock mode relies on an external logic level
signal as the device clock source. The LP, XT and HS
clock modes require an external crystal or resonator to
be connected to the device. Each mode is optimized for
a different frequency range. The RC Clock mode
requires an external resistor and capacitor to set the
oscillator frequency.
The INTOSC internal oscillator block produces a low
and
high
frequency clock
source,
designated
LFINTOSC and HFINTOSC. (see Internal Oscillator
Block, Figure 5-1). A wide selection of device clock
frequencies may be derived from these two clock
sources.
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