參數(shù)資料
型號(hào): PIC16F630-I/ST
廠商: Microchip Technology
文件頁(yè)數(shù): 87/132頁(yè)
文件大?。?/td> 0K
描述: IC MCU FLASH 1KX14 EEPROM14TSSOP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 96
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,WDT
輸入/輸出數(shù): 12
程序存儲(chǔ)器容量: 1.75KB(1K x 14)
程序存儲(chǔ)器類(lèi)型: 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-TSSOP(0.173",4.40mm 寬)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 638 (CN2011-ZH PDF)
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PIC16F630/676
DS40039F-page 58
2010 Microchip Technology Inc.
9.2.3
EXTERNAL CLOCK IN
For applications where a clock is already available
elsewhere, users may directly drive the PIC16F630/
676 provided that this external clock source meets the
AC/DC timing requirements listed in Section 12.0
an external clock circuit should be configured.
9.2.4
RC OSCILLATOR
For applications where precise timing is not a
requirement, the RC oscillator option is available. The
operation and functionality of the RC oscillator is
dependent upon a number of variables. The RC
oscillator frequency is a function of:
Supply voltage
Resistor (REXT) and capacitor (CEXT) values
Operating temperature
The oscillator frequency will vary from unit to unit due
to normal process parameter variation. The difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
CEXT values. The user also needs to account for the
tolerance of the external R and C components.
Figure 9-3 shows how the R/C combination is
connected.
Two options are available for this Oscillator mode
which allow RA4 to be used as a general purpose I/O
or to output FOSC/4.
FIGURE 9-3:
RC OSCILLATOR MODE
9.2.5
INTERNAL 4 MHZ OSCILLATOR
When calibrated, the internal oscillator provides a fixed
4 MHz (nominal) system clock. See Electrical
tions”, for information on variation over voltage and
temperature.
Two options are available for this Oscillator mode
which allow RA4 to be used as a general purpose I/O
or to output FOSC/4.
9.2.5.1
Calibrating the Internal Oscillator
A calibration instruction is programmed into the last
location of program memory. This instruction is a
RETLW XX
, where the literal is the calibration value.
The literal is placed in the OSCCAL register to set the
calibration of the internal oscillator. Example 9-1
demonstrates how to calibrate the internal oscillator.
For best operation, decouple (with capacitance) VDD
and VSS as close to the device as possible.
EXAMPLE 9-1:
CALIBRATING THE
INTERNAL OSCILLATOR
9.2.6
CLKOUT
The PIC16F630/676 devices can be configured to
provide a clock out signal in the INTOSC and RC
Oscillator modes. When configured, the oscillator
frequency divided by four (FOSC/4) is output on the
RA4/OSC2/CLKOUT pin. FOSC/4 can be used for test
purposes or to synchronize other logic.
RA4/OSC2/CLKOUT
CEXT
VDD
REXT
VSS
PIC16F630/676
RA5/OSC1/
FOSC/4
Internal
Clock
CLKIN
Note:
Erasing the device will also erase the pre-
programmed internal calibration value for
the internal oscillator. The calibration value
must be saved prior to erasing part as
specified in the PIC16F630/676 Program-
ming specification. Microchip Develop-
ment Tools maintain all calibration bits to
factory settings.
BSF
STATUS, RP0
;Bank 1
CALL
3FFh
;Get the cal value
MOVWF
OSCCAL
;Calibrate
BCF
STATUS, RP0
;Bank 0
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