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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M16C/1N датащи(PDF) 141 Page - Renesas Technology Corp |
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M16C/1N датащи(HTML) 141 Page - Renesas Technology Corp |
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141 / 238 page  Rev.1.00 Oct 20, 2004 page 129 of 222 M16C/1N Group 15. D/A Converter REJ09B0007-0100Z 15. D/A Converter This is an 8-bit, R-2R type D/A converter. The microcomputer contains one independent D/A converter of this type. D/A conversion is performed when a value is written to the corresponding D/A register. Bit 0 (D/A output enable bit) of the D/A control register decide if the result of conversion is to be output. Do not set the target port to output mode if D/A conversion is to be performed. When D/A output is set for enabled, the corre- sponding port is inhibited to be pulled up. 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 voltage Table 15.1 lists the performance of the D/A converter. Figure 15.1 shows the block diagram of the D/A converter, Figure 15.2 shows the D/A control register and Figure 15.3 shows D/A converter equivalent circuit. D/A register (8) R-2R resistance ladder (Address 00D816) D/A output enable bit P34 / CLKS1 / DA Table 15.1 Performance of D/A converter Item Performance Conversion method R-2R method Resolution 8 bits Analog output pin 1 channel Figure 15.1 Block diagram of D/A converter |
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