Datasheet

Section 24 A/D Converter
Page 832 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
24.3 Operation
The A/D converter operates in two operating modes as shown in table 24.5. In A/D conversion
mode, the A/D converter converts the analog input of the selected channel by successive
approximation with 10-bit resolution. In compare mode, the analog input of the selected channel is
compared with the voltage to be specified.
Each operating mode has two operating modes: single mode and scan mode. When changing the
analog input channel, to prevent incorrect operation, first clear the ADST bit in ADCSR to 0. The
ADST bit can be set at the same time as the operating mode or analog input channel is changed.
Table 24.5 A/D Converter Operating Mode
Operating Mode Channel Selection Mode Register Setting
A/D conversion mode Single mode ADM1 = 0, SCANE = 0
Scan mode ADM1 = 0, SCANE = 1
Compare mode Single mode ADM1 = 1, SCANE = 0
Scan mode ADM1 = 1, SCANE = 1