Datasheet

Section 18 D/A Converter
Rev. 4.00 Jun 06, 2006 page 547 of 1004
REJ09B0301-0400
Bit 6—D/A Output Enable 0 (DAOE0): Controls D/A conversion and analog output.
Bit 6
DAOE0 Description
0 Analog output DA0 is disabled (Initial value)
1 D/A conversion is enabled on channel 0. Analog output DA0 is enabled
Bit 5—D/A Enable (DAE): Controls D/A conversion, in combination with bits DAOE0 and
DAOE1. D/A conversion is controlled independently on channels 0 and 1 when DAE = 0.
Channels 0 and 1 are controlled together when DAE = 1.
Output of the converted results is always controlled independently by DAOE0 and DAOE1.
Bit 7
DAOE1
Bit 6
DAOE0
Bit 5
DAE D/A conversion
00* Disabled on channels 0 and 1
1 0 Enabled on channel 0
Disabled on channel 1
1 Enabled on channels 0 and 1
1 0 0 Disabled on channel 0
Enabled on channel 1
1 Enabled on channels 0 and 1
1 * Enabled on channels 0 and 1
*: Don’t care
If the H8S/2138 Group chip enters software standby mode while D/A conversion is enabled, the
D/A output is retained and the analog power supply current is the same as during D/A conversion.
If it is necessary to reduce the analog power supply current in software standby mode, disable D/A
output by clearing both the DAOE0, DAOE1 and DAE bits to 0.
Bits 4 to 0—Reserved: These bits cannot be modified and are always read as 1.