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13
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13 DAC 0832 ADC 0809
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13.1 ADCA/DA/D
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13.2 D/A
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13.2.1 D/A
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D/A1
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D/A2
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D/A3VaVREFVbVREF/2VcVREF/4VdVREF/8I0Vd/2RVREF/82RI1Vd/2RVREF/42RI2Vd/2RVREF/22RI3Vd/2RVREF/12R
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D/A4Iout1I0I1I2I3VREF/2R1/81/41/21RfbRVoutIout1RfbVREF[20212223/24]VoutD/2nVREF
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13.2.2 DAC0832DAC08328DAC
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DAC0832
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1. DAC08328DI0DI7DI01ILECS*WR1*DAC2XFER*WR2*
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LE1LE0
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DAC0832LE1LE21D/A
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DAC0832LE11LE21
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DAC0832D/A
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2. DAC0832Iout1Iout2RfbVREF10V10VAGNDVCC5V15VDGND
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VoutIout1RfbD/28VREF
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VREF5VDFFH255Vmax255/2565V4.98VD00HVmin0/2565V0VD01HLSBVLSB1/2565V0.02VVoutD/2nVREF
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R2R32R1 Vout22Vout1VREF Vout1D/28VREF Vout2[D27/27]VREF
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VREF5VDFFH255Vmax[255128/128]5V4.96VD00HVmin[0128/128]5V5VD81H129VLSB[129128/128]5V0.04VVout[D27/27]VREF
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3.
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4.
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13.2.3 DACDACDAC1. DAC2. DAC
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1. DACmov al,bufmov dx,portdout dx,al
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DAC0832
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2. DACDAC
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mov dx,port1mov al,blout dx,almov dx,port2mov al,bhout dx,al
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13.2.4 DACmov dx,portdmov al,0repeat:out dx,alinc aljmp
repeat
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13.3 A/D
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13.3.1 A/DA/D4
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1.
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2.
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3. /
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4.
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13.3.2 ADC0809A/DCMOS8ADC100 s
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ADC0809
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1. ADC08098IN0IN78ADDAADDBADDC3ALEALE38A/D
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2. ADC0809
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3. ADC0809ADC0809D0D7OEOED0D7
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4. ADC0809
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VREF(+)5VVREF()0VVin1.5VN 1.505025676.8774DH
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VREF(+)5VVREF()5VVin1.5VN 1.555525689.6905AH
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13.3.3 ADCADC
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1. ADCADCADC
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2. A/D1
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2. A/D2ADC
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3. DMADMA
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13.3.4 ADC12.2 12.3
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;adtemp db 0;;;sti;mov dx,220hout dx,al;A/D;13.2
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adintprocsti;push ax;push dxpush dsmov ax,@data;DSmov ds,axmov
dx,220hin al,dx;A/Dmov adtemp,al;13.2
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mov al,20h;EOIout 20h,alpop ds;pop dxpop
axiret;adintendp13.2
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805V
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;counterequ 8bufdb counter dup(0);;mov bx,offset bufmov
cx,countermov dx,220h;IN0start1:out dx,al;A/Dpush dx13.3
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mov dx,238h;start2:in al,dx;test al,80h;D71?jz start2;pop dx;in
al,dx;mov [bx],al;inc bxinc dxloop start1;13.3
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131. 2. D/AA/D3. DAC0832ADC08094. DACADC5. ADC13 308 13.2 13.3
13.6 13.7
