SH7080 Datasheet, PDF (1025/1644 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 19 A/D Converter (ADC)
19.4.7 2-Channel Scanning
In 2-channel scan mode, since the four channels of analog input are divided into groups 0 and 1,
triggers for activation of groups 0 and 1 are independently specifiable. Conversion end interrupts
in 2-channel scan mode can be generated either on completion of group 0 or group 1 or on
completion of group 0 and group 1. If conversion is to be started by triggers, the different sources
for groups 0 and 1 are specified in ADTSR. A request for conversion by group 1 generated during
conversion by group 0 is ignored. Figure 19.4 shows an example of operation when TRG4AN of
the MTU2 has been specified as the A/D conversion start request by group 0 and TRG4BN of the
MTU2 has been specified as the A/D conversion start request by group 1.
TGRA_3
TADCORA_4
TADCORB_4
TCNT_4
H'0000
A/D conversion start request
A/D conversion end (ADF)
CONADF bit in ADCSR = 1
AN0
AN1
AN2
AN3
conversion conversion conversion conversion
CONADF bit in ADCSR = 0
Figure 19.4 Example of 2-Channel Scanning
Rev. 3.00 May 17, 2007 Page 967 of 1582
REJ09B0181-0300