ADC_
csr = ADC_(CSR);
cr = ADC_(CR);
ADC_(CSR) = chan | SH7709_ADCSR_ADST | SH7709_ADCSR_CKS;
csr = ADC_(CSR);
ADC_(CSR) = csr;
ADC_(CSR) = 0;
ADC_(CR) = 0;