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      參數(shù)資料
      型號: MAX192ACWP
      廠商: MAXIM INTEGRATED PRODUCTS INC
      元件分類: ADC
      英文描述: Fixed-Point Digital Signal Processor 288-FCBGA
      中文描述: 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
      封裝: SO-20
      文件頁數(shù): 21/24頁
      文件大?。?/td> 201K
      代理商: MAX192ACWP
      M
      Low-Power, 8-Channel,
      S erial 10-Bit ADC
      ______________________________________________________________________________________
      21
      * Description :
      *
      *
      *
      *
      * Roger J .A. Chen, Applications Engineer
      * MAXIM Integrated Products
      * November 20, 1992
      *
      ******************************************************************************************************************************************************
      INCLUDE ‘EQUATES.ASM’ ;Equates for common reg addrs
      INCLUDE ‘ORG00000.ASM’ ;initialize reset vector
      INCLUDE ‘ORG00008.ASM’ ;initialize interrupt vectors
      ORG $0200
      ;start program after interrupt vectors
      INCLUDE ‘INITSYS.ASM’
      ;set EK=F,XK=0,YK=0,ZK=0
      ;set sys clock at 16.78 MHz, COP off
      INCLUDE ‘INITRAM.ASM’ ;turn on internal SRAM at $10000
      ;set stack (SK=1, SP=03FE)
      MAIN:
      J SR INITQSPI
      MAINLOOP:
      J SR READ192
      WAIT:
      LDAA SPSR
      ANDA #$80
      BEQ WAIT
      ;wait for QSPI to finish
      BRA MAINLOOP
      ENDPROGRAM:
      This is a shell program for using a stand-alone 68HC16 without any external memory. The internal 1K RAM
      is put into bank $0F to maintain 68HC11 code compatibility. This program was written with software
      provided in the Motorola 68HC16 Evaluation Kit.
      INITQSPI:
      ;This routine sets up the QSPI microsequencer to operate on its own.
      ;The sequencer will read all eight channels of a MAX192 each time
      ;it is triggered. The A/D converter results will be left in the
      ;receive data RAM. Each 16 bit receive data RAM location will
      ;have a leading zero, 10 + 2 bits of conversion result and three zeros.
      ;
      ;Receive RAM Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
      ;A/D Result 0 MSB LSB 0 0 0
      ***** Initialize the QSPI Registers ******
      PSHA
      PSHB
      LDAA #%01111000
      STAA QPDR
      ;idle state for PCS0-3 = high
      LDAA #%01111011
      STAA QPAR
      ;assign port D to be QSPI
      LDAA #%01111110
      STAA QDDR
      ;only MISO is an input
      LDD #$8008
      STD SPCR0
      ;master mode,16 bits/transfer,
      ;CPOL=CPHA=0,1MHz Ser Clock
      LDD #$0000
      STD SPCR1
      ;set delay between PCS0 and SCK,
      ;set delay between transfers
      Figure 20. MAX192 Assembly-Code Listing
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