參數(shù)資料
型號： PIC16LF1527-I/PT
廠商： Microchip Technology
文件頁數(shù)： 89/94頁
文件大?。?/td> 0K
描述： MCU PIC 28KB FLASH 64TQFP
產(chǎn)品培訓模塊： Configurable Logic Cell
8-bit PIC® Microcontroller Portfolio
標準包裝： 160
系列： PIC® XLP™ 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
連通性： I²C，LIN，SPI，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 54
程序存儲器容量： 28KB（16K x 14）
程序存儲器類型： 閃存
RAM 容量： 1.5K x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 30x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-TQFP
包裝： 托盤
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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