參數(shù)資料
      型號: PIC16F871T-E/L
      廠商: Microchip Technology
      文件頁數(shù): 124/143頁
      文件大?。?/td> 0K
      描述: IC MCU CMOS 20MHZ 2K FLSH 44PLCC
      標(biāo)準(zhǔn)包裝: 500
      系列: PIC® 16F
      核心處理器: PIC
      芯體尺寸: 8-位
      速度: 20MHz
      連通性: UART/USART
      外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
      輸入/輸出數(shù): 33
      程序存儲器容量: 3.5KB(2K x 14)
      程序存儲器類型: 閃存
      EEPROM 大?。?/td> 64 x 8
      RAM 容量: 128 x 8
      電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
      數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
      振蕩器型: 外部
      工作溫度: -40°C ~ 125°C
      封裝/外殼: 44-LCC(J 形引線)
      包裝: 帶卷 (TR)
      2003 Microchip Technology Inc.
      DS30569B-page 79
      PIC16F870/871
      10.0
      ANALOG-TO-DIGITAL (A/D)
      CONVERTER MODULE
      The Analog-to-Digital (A/D) Converter module has five
      inputs for the 28-pin devices and eight for the other
      devices.
      The analog input charges a sample and hold capacitor.
      The output of the sample and hold capacitor is the input
      into the converter. The converter then generates a dig-
      ital result of this analog level via successive approxima-
      tion. The A/D conversion of the analog input signal
      results in a corresponding 10-bit digital number. The
      A/D module has high and low voltage reference input
      that is software selectable to some combination of VDD,
      VSS, RA2, or RA3.
      The A/D converter has a unique feature of being able
      to operate while the device is in SLEEP mode. To oper-
      ate in SLEEP, the A/D clock must be derived from the
      A/D’s internal RC oscillator.
      The A/D module has four registers. These registers
      are:
      A/D Result High Register (ADRESH)
      A/D Result Low Register (ADRESL)
      A/D Control Register0 (ADCON0)
      A/D Control Register1 (ADCON1)
      The ADCON0 register, shown in Register 10-1, con-
      trols the operation of the A/D module. The ADCON1
      register, shown in Register 10-2, configures the func-
      tions of the port pins. The port pins can be configured
      as analog inputs (RA3 can also be the voltage
      reference), or as digital I/O.
      Additional information on using the A/D module can be
      found in the PICmicro Mid-Range MCU Family
      Reference Manual (DS33023).
      REGISTER 10-1:
      ADCON0 REGISTER (ADDRESS: 1Fh)
      R/W-0
      U-0
      R/W-0
      ADCS1
      ADCS0
      CHS2
      CHS1
      CHS0
      GO/DONE
      —ADON
      bit 7
      bit 0
      bit 7-6
      ADCS1:ADCS0: A/D Conversion Clock Select bits
      00
      = FOSC/2
      01
      = FOSC/8
      10
      = FOSC/32
      11
      = FRC (clock derived from the internal A/D module RC oscillator)
      bit 5-3
      CHS2:CHS0: Analog Channel Select bits
      000
      = Channel 0, (RA0/AN0)
      010
      = Channel 2, (RA2/AN2)
      011
      = Channel 3, (RA3/AN3)
      100
      = Channel 4, (RA5/AN4)
      101
      = Channel 5, (RE0/AN5)(1)
      110
      = Channel 6, (RE1/AN6)(1)
      111
      = Channel 7, (RE2/AN7)(1)
      bit 2
      GO/DONE: A/D Conversion Status bit
      If ADON = 1:
      1
      = A/D conversion in progress (setting this bit starts the A/D conversion)
      0
      = A/D conversion not in progress (this bit is automatically cleared by hardware when the A/D
      conversion is complete)
      bit 1
      Unimplemented: Read as '0'
      bit 0
      ADON: A/D On bit
      1
      = A/D converter module is operating
      0
      = A/D converter module is shut-off and consumes no operating current
      Note 1: These channels are not available on the PIC16F870 device.
      Legend:
      R = Readable bit
      W = Writable bit
      U = Unimplemented bit, read as ‘0’
      - n = Value at POR
      ‘1’ = Bit is set
      ‘0’ = Bit is cleared
      x = Bit is unknown
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