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AD8803AN Folha de dados(PDF) 10 Page - Analog Devices |
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AD8803AN Folha de dados(HTML) 10 Page - Analog Devices |
10 / 16 page REV. A –10– AD8801/AD8803 ; ; This subroutine loads an AD8801/AD8803 DAC from an 8051 microcomputer, ; using the 8051’s serial port in MODE 0 (Shift Register Mode). ; The DAC value is stored at location DAC_VAL ; The DAC address is stored at location DAC_ADDR ; ; Variable declarations ; PORT1 DATA 90H ;SFR register for port 1 DAC_VALUE DATA 40H ;DAC Value DAC_ADDR DATA 41H ;DAC Address SHIFT1 DATA 042H ;high byte of 16-bit answer SHIFT2 DATA 043H ;low byte of answer SHIFT_COUNT DATA 44H ; ; ORG 100H ;arbitrary start DO_8801: CLR SCON.7 ;set serial CLR SCON.6 ; data mode 0 CLR SCON.5 CLR SCON.1 ;clr transmit flag ORL PORT1.1,#00001110B ;/RS, /SHDN, /CS high CLR PORT1.1 ;set the /CS low MOV SHIFT1,DAC_ADDR ;put DAC value in shift register ACALL BYTESWAP ; MOV SBUF,SHIFT2 ;send the address byte ADDR_WAIT: JNB SCON.1,ADDR_WAIT ;wait until 8 bits are sent CLR SCON.1 ;clear the serial transmit flag MOV SHIFT1,DAC_VALUE ;send the DAC value ACALL BYTESWAP ; MOV SBUF,SHIFT2 ; VALU_WAIT: JNB SCON.1,VALU_WAIT ;wait again CLR SCON.1 ;clear serial flag SETB PORT1.1 ;/CS high, latch data RET ; into AD8801 ; BYTESWAP: MOV SHIFT_COUNT,#8 ;Shift 8 bits SWAP_LOOP: MOV A,SHIFT1 ;Get source byte RLC A ;Rotate MSB to carry MOV SHIFT1,A ;Save new source byte MOV A,SHIFT2 ;Get destination byte RRC A ;Move carry to MSB MOV SHIFT2,A ;Save DJNZ SHIFT_COUNT,SWAP_LOOP ;Done? RET END Listing 1. Software for the 8051 to AD8801/AD8803 Serial Port Interface |
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