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      參數(shù)資料
      型號: PIC18F2480-I/SP
      廠商: Microchip Technology
      文件頁數(shù): 54/88頁
      文件大?。?/td> 0K
      描述: IC PIC MCU FLASH 8KX16 28DIP
      產(chǎn)品培訓模塊: Asynchronous Stimulus
      PIC18 J Series MCU Overview
      8-bit PIC® Microcontroller Portfolio
      標準包裝: 15
      系列: PIC® 18F
      核心處理器: PIC
      芯體尺寸: 8-位
      速度: 40MHz
      連通性: CAN,I²C,SPI,UART/USART
      外圍設(shè)備: 欠壓檢測/復位,HLVD,POR,PWM,WDT
      輸入/輸出數(shù): 25
      程序存儲器容量: 16KB(8K x 16)
      程序存儲器類型: 閃存
      EEPROM 大小: 256 x 8
      RAM 容量: 768 x 8
      電壓 - 電源 (Vcc/Vdd): 4.2 V ~ 5.5 V
      數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
      振蕩器型: 內(nèi)部
      工作溫度: -40°C ~ 85°C
      封裝/外殼: 28-DIP(0.300",7.62mm)
      包裝: 管件
      產(chǎn)品目錄頁面: 645 (CN2011-ZH PDF)
      配用: DVA18XP280-ND - DEVICE ADAPTER 18F2220 PDIP 28LD
      MCP2515
      DS21801F-page 58
      2010 Microchip Technology Inc.
      10.4
      Loopback Mode
      Loopback mode will allow internal transmission of
      messages from the transmit buffers to the receive
      buffers without actually transmitting messages on the
      CAN bus. This mode can be used in system
      development and testing.
      In this mode, the ACK bit is ignored and the device will
      allow incoming messages from itself just as if they were
      coming from another node. The Loopback mode is a
      silent mode, meaning no messages will be transmitted
      while in this state (including error flags or acknowledge
      signals). The TXCAN pin will be in a recessive state.
      The filters and masks can be used to allow only
      particular messages to be loaded into the receive
      registers. The masks can be set to all zeros to provide
      a mode that accepts all messages. The Loopback
      mode is activated by setting the mode request bits in
      the CANCTRL register.
      10.5
      Normal Mode
      Normal mode is the standard operating mode of the
      MCP2515. In this mode, the device actively monitors all
      bus messages and generates acknowledge bits, error
      frames, etc. This is also the only mode in which the
      MCP2515 will transmit messages over the CAN bus.
      REGISTER 10-1:
      CANCTRL – CAN CONTROL REGISTER
      (ADDRESS: XFh)
      R/W-1
      R/W-0
      R/W-1
      REQOP2
      REQOP1
      REQOP0
      ABAT
      OSM
      CLKEN
      CLKPRE1
      CLKPRE0
      bit 7
      bit 0
      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
      bit 7-5
      REQOP: Request Operation Mode bits <2:0>
      000
      =
      Set Normal Operation mode
      001
      =
      Set Sleep mode
      010
      =
      Set Loopback mode
      011
      =
      Set Listen-only mode
      100
      =
      Set Configuration mode
      All other values for REQOP bits are invalid and should not be used
      On power-up, REQOP = b’111’
      bit 4
      ABAT: Abort All Pending Transmissions bit
      1
      = Request abort of all pending transmit buffers
      0
      = Terminate request to abort all transmissions
      bit 3
      OSM: One Shot Mode bit
      1
      = Enabled. Message will only attempt to transmit one time
      0
      = Disabled. Messages will reattempt transmission, if required
      bit 2
      CLKEN: CLKOUT Pin Enable bit
      1
      = CLKOUT pin enabled
      0
      = CLKOUT pin disabled (Pin is in high-impedance state)
      bit 1-0
      CLKPRE: CLKOUT Pin Prescaler bits <1:0>
      00
      =FCLKOUT = System Clock/1
      01
      =FCLKOUT = System Clock/2
      10
      =FCLKOUT = System Clock/4
      11
      =FCLKOUT = System Clock/8
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