SH7065 Datasheet, PDF (643/941 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Section 15 A/D Converter
15.7.5 Simultaneous A/D and D/A Conversion
If A/D conversion is started during D/A conversion and analog voltage output while the DAE bit
is cleared to 0 in the D/A converter’s D/A control register (DACR), the analog power supply
current increases sharply, and noise may occur in the analog output of the D/A converter. When
using the A/D converter and D/A converter simultaneously, noise in the analog output can be
prevented by setting the DAE bit in DACR to 1 beforehand.
However, when the DAE bit is set to 1, even if bits DAOE0 and DAOE1 in DACR and the ADST
bit in ADCSR are cleared to 0, the same current is drawn from the analog power supply as during
simultaneous A/D and D/A conversion.
Rev. 5.00 Sep 11, 2006 page 621 of 916
REJ09B0332-0500