279CHAPTER 15 D/A CONVERTER15.1 D/A Converter FunctionsThe D/A converter converts a digital input into an analog value. It consists of two 8-bit resolution channels of voltageoutput type D/A converter.The conversion method used is the R-2R resistor ladder method.D/A conversion is started by setting the DACE0 and DACE1 of the D/A converter mode register (DAM).There are two types of modes for the D/A converter, as follows.(1) Normal modeOutputs an analog voltage signal immediately after the D/A conversion.(2) Real-time output modeOutputs an analog voltage signal synchronously with the output trigger after the D/A conversion.Since a sine wave can be generated in this mode, it is useful for an MSK modem for cordless telephone sets.
