ADC1 data are read by two methods: read data direct or read data by command. ADC1 writes new conversion data to the output shift register and the internal data-holding register. Two registers hold the conversion data; therefore, data are read either from the output shift register (in direct mode) or read from the data-holding register (in command mode). Reading data from the data-holding register (command mode) does not require synchronizing the start of data readback to DRDY. ADC2 data are read only from the ADC2 data-holding register (command mode).