23.4.1 ADC Status and Control Registers 1 (ADCx_SC1n)SC1A is used for both software and hardware trigger modes of operation.To allow sequential conversions of the ADC to be triggered by internal peripherals, theADC can have more than one status and control register: one for each conversion. TheSC1B–SC1n registers indicate potentially multiple SC1 registers for use only in hardwaretrigger mode. See the chip configuration information about the number of SC1n registersspecific to this device. The SC1n registers have identical fields, and are used in a "ping-pong" approach to control ADC operation.At any one point in time, only one of the SC1n registers is actively controlling ADCconversions. Updating SC1A while SC1n is actively controlling a conversion is allowed,and vice-versa for any of the SC1n registers specific to this MCU.Writing SC1A while SC1A is actively controlling a conversion aborts the currentconversion. In Software Trigger mode, when SC2[ADTRG]=0, writes to SC1Asubsequently initiate a new conversion, if SC1[ADCH] contains a value other than all 1s(module disabled).Writing any of the SC1n registers while that specific SC1n register is actively controllinga conversion aborts the current conversion. None of the SC1B-SC1n registers are used forsoftware trigger operation and therefore writes to the SC1B–SC1n registers do not initiatea new conversion.Address: 4003_B000h base + 0h offset + (4d × i), where i=0d to 1dBit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16R 0WReset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0Chapter 23 Analog-to-Digital Converter (ADC)KL27 Sub-Family Reference Manual , Rev. 5, 01/2016Freescale Semiconductor, Inc. 343
