Chapter 16 d/a converter, 1 d/a converter functions – NEC uPD78P078 User Manual
Page 309
309
CHAPTER 16 D/A CONVERTER
16.1 D/A Converter Functions
The D/A converter converts a digital input into an analog value. It consists of two 8-bit resolution channels of
voltage output type D/A converter.
The conversion method used is the R-2R resistor ladder method.
Start the A/D conversion 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 mode
Outputs an analog voltage signal immediately after the D/A conversion.
(2) Real-time output mode
Outputs an analog voltage signal synchronously with the output trigger after the D/A conversion.
Since a sine wave can be generated in the mode, the use of this mode easily realizes an MSK modem for
cordless telephone sets.