M16C/62 Group DATASHEET

D-A ConverterMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERD-A ConverterThis is an 8-bit, R-2R type D-A converter. The microcomputer contains two independent D-A converters ofthis type.D-A conversion is performed when a value is written to the corresponding D-A register. Bits 0 and 1 (D-Aoutput enable bits) of the D-A control register decide if the result of conversion is to be output. Do not set thetarget port to output mode if D-A conversion is to be performed.Output analog voltage (V) is determined by a set value (n : decimal) in the D-A register.V = VREF X n/ 256 (n = 0 to 255)VREF : reference voltageTable 1.21.1 lists the performance of the D-A converter. Figure 1.21.1 shows the block diagram of the D-Aconverter. Figure 1.21.2 shows the D-A control register. Figure 1.21.3 shows the D-A converter equivalentcircuit.Table 1.21.1. Performance of D-A converterItemConversion methodResolutionAnalog output pinR-2R method8 bits2 channelsPerformanceData bus low-order bitsD-A register0 (8)(Address 03D816)D-A0 output enable bitR-2R resistor ladderP93/DA0D-A register1 (8)(Address 03DA16)D-A1 output enable bitR-2R resistor ladderP94/DA1Figure 1.21.1. Block diagram of D-A converter162