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参数资料
| 型号： | PIC16F1527-I/PT |
| 厂商： | Microchip Technology |
| 文件页数： | 89/94页 |
| 文件大小： | 0K |
| 描述： | MCU 28KB FLASH 1536B RAM 64-TQFP |
| 产品培训模块： | Configurable Logic Cell 8-bit PIC® Microcontroller Portfolio |
| 特色产品： | Extreme Low Power (XLP) Microcontrollers |
| 标准包装： | 160 |
| 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)： | 2.3 V ~ 5.5 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-TQFP |
| 包装： | 托盘 |
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2011 Microchip Technology Inc.
Preliminary
DS41458B-page 55
PIC16(L)F1526/27
5.2.1.4
Secondary Oscillator
The secondary oscillator is a separate crystal oscillator
that is associated with the Timer1 peripheral. It is opti-
mized for timekeeping operations with a 32.768 kHz
crystal connected between the SOSCO and SOSCI
device pins.
The secondary oscillator can be used as an alternate
system clock source and can be selected during
run-time using clock switching. Refer to Section 5.3
for more information.
FIGURE 5-5:
QUARTZ CRYSTAL
OPERATION
(SECONDARY
OSCILLATOR)
5.2.1.5
External RC Mode
The external Resistor-Capacitor (RC) modes support
the use of an external RC circuit. This allows the
designer maximum flexibility in frequency choice while
keeping costs to a minimum when clock accuracy is not
required.
The RC circuit connects to OSC1. OSC2/CLKOUT is
available for general purpose I/O or CLKOUT. The
function of the OSC2/CLKOUT pin is determined by the
state of the CLKOUTEN bit in Configuration Word 1.
Figure 5-6 shows the external RC mode connections.
FIGURE 5-6:
EXTERNAL RC MODES
The RC oscillator frequency is a function of the supply
voltage, the resistor (REXT) and capacitor (CEXT) values
and the operating temperature. Other factors affecting
the oscillator frequency are:
threshold voltage variation
component tolerances
packaging variations in capacitance
The user also needs to take into account variation due
to tolerance of external RC components used.
Note 1:
Quartz
crystal
characteristics
vary
according
to
type,
package
and
manufacturer. The user should consult the
manufacturer data sheets for specifications
and recommended application.
2:
Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
3:
For oscillator design assistance, reference
the following Microchip Applications Notes:
AN826, “Crystal Oscillator Basics and
Crystal Selection for rfPIC and PIC
Devices
” (DS00826)
AN849, “Basic PIC Oscillator Design”
(DS00849)
AN943, “Practical PIC Oscillator
Analysis and Design
” (DS00943)
AN949, “Making Your Oscillator Work”
(DS00949)
TB097, “Interfacing a Micro Crystal
MS1V-T1K 32.768 kHz Tuning Fork
Crystal to a PIC16F690/SS
” (DS91097)
AN1288, “Design Practices for
Low-Power External Oscillators
”
(DS01288)
C1
C2
32.768 kHz
SOSCI
To Internal
Logic
PIC MCU
Crystal
SOSCO
Quartz
OSC2/CLKOUT
CEXT
REXT
PIC MCU
OSC1/CLKIN
FOSC/4 or
Internal
Clock
VDD
VSS
Recommended values: 10 k
REXT 100 k, <3V
3 k
REXT 100 k, 3-5V
CEXT > 20 pF, 2-5V
Note
1:
Output depends upon CLKOUTEN bit of the
Configuration Word 1.
I/O(1)
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