Datasheet

Table Of Contents
Section 17 D/A Converter
REJ09B0140-0900 Rev. 9.00 Page 621 of 846
Sep 16, 2010
H8S/2215 Group
17.3.2 D/A Control Register (DACR)
DACR controls the operation of the D/A converter.
DACR01
Bit Bit Name Initial Value R/W Description
7
6
5
DAOE1
DAOE0
DAE
0
0
0
R/W
R/W
R/W
D/A Output Enable 1
D/A Output Enable 0
D/A Enable
Control the D/A conversion and analog output.
00×: Channel 0 and 1 D/A conversions disabled
010: Channel 0 D/A conversion enabled
Channel 1 D/A conversion disabled
011: Channel 0 and 1 D/A conversions enabled
100: Channel 0 D/A conversion disabled
Channel 1 D/A conversion enabled
101: Channel 0 and 1 D/A conversions enabled
11×: Channel 0 and 1 D/A conversions enabled
Legend: ×: Don’t care
If this LSI enters software standby mode when D/A
conversion is enabled, the D/A output is held and the
analog power current is the same as during D/A
conversion. When it is necessary to reduce the analog
power current in software standby mode, clear the
DAOE0, DAOE1, and DAE bits to 0 to disable D/A
output.
4 to 0 All 1 Reserved
These bits are always read as 1 and cannot be modified.
17.4 Operation
D/A conversion takes place constantly as long as the D/A converter is enabled by the DACR.
When DADR_0 and DADR_1 are overwritten, the new data is converted immediately. The
conversion result is output by setting the DAOE0 and DAOE1 bits to 1.
The operation example concerns D/A conversion on channel 0. Figure 17.2 shows the timing of
this operation.