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SH7280 Datasheet, PDF (1045/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family
21.5 Usage Notes
Section 21 D/A Converter (DAC) (SH7286 Only)
21.5.1 Module Standby Mode Setting
Operation of the D/A converter can be disabled or enabled using the standby control register. The
initial setting is for operation of the D/A converter to be halted. Register access is enabled by
canceling module standby mode. For details, see section 28, Power-Down Modes.
21.5.2 D/A Output Hold Function in Software Standby Mode
When this LSI enters software standby mode with D/A conversion enabled, the D/A outputs are
retained, and the analog power supply current is equal to as during D/A conversion. If the analog
power supply current needs to be reduced in software standby mode, clear the DAOE0, DAOE1,
and DAE bits to 0 to disable the D/A outputs.
21.5.3 Setting Analog Input Voltage
The reliability of this LSI may be adversely affected if the following voltage ranges are exceeded.
1. AVcc and AVss input voltages
Input voltages AVcc and AVss should be Vcc − 0.3 V ≤ AVcc and AVss = Vss. Do not leave
the AVcc and AVss pins open when the A/D converter or D/A converter is not in use and in
software standby mode. When not in use, connect AVcc to the power supply (Vcc) and AVss
to the ground (Vss).
2. Setting range of AVREF input voltage
Set the voltage range of the AVREF pin as AVREF = 4.5 V to AVCC when the A/D converter
or D/A converter is used, or as AVREF = AVCC when no A/D converter or D/A converter is
used.
Rev. 1.00 Jun. 26, 2008 Page 1015 of 1692
REJ09B0393-0100