Information

ADC memory map (continued)
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4003_B060
ADC minus-side general calibration value register
(ADC0_CLM3)
32 R/W 0000_0100h
31.3.21/
603
4003_B064
ADC minus-side general calibration value register
(ADC0_CLM2)
32 R/W 0000_0080h
31.3.22/
604
4003_B068
ADC minus-side general calibration value register
(ADC0_CLM1)
32 R/W 0000_0040h
31.3.23/
604
4003_B06C
ADC minus-side general calibration value register
(ADC0_CLM0)
32 R/W 0000_0020h
31.3.24/
605
31.3.1 ADC status and control registers 1 (ADCx_SC1n)
The SC1A register is used for both software and hardware trigger modes of operation.
To allow sequential conversions of the ADC to be triggered by internal peripherals, the
ADC can have more then one status and control register: one for each conversion. The
SC1B-SC1n registers indicate potentially multiple SC1 registers for use only in hardware
trigger mode. Refer to the Chip Configuration information about the number of SC1n
registers specific 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 ADC
conversions. 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 current
conversion. In software trigger mode (ADTRG=0), writes to the SC1A register
subsequently initiate a new conversion (if the ADCH bits are equal to a value other than
all 1s).
Similarly, writing any of the SC1n registers while that specific SC1n register is actively
controlling a conversion aborts the current conversion. None of the SC1B-SC1n registers
are used for software trigger operation and therefore writes to the SC1B - SC1n registers
do not initiate a new conversion.
Chapter 31 Analog-to-Digital Converter (ADC)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 585