Manualshelf

Integrated Microcontroller Reference Manual

ManualsBrandsFreescale Semiconductor ManualsNetwork CardColdFire MCF52213
451452453454455456457458459460
Analog-to-Digital Converter (ADC)
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
26-22 Freescale Semiconductor
Parallel scan can be simultaneous or non-simultaneous. During simultaneous scan, the scans in the two
converters are done simultaneously and always result in simultaneous pairs of conversions, one by
converter A and one by converter B. The two converters share the same start, stop, sync, end-of-scan
interrupt enable control, and interrupt. Scanning in both converters is terminated when either converter
encounters a disabled sample. In non-simultaneous scan, the parallel scans in the two converters are
achieved independently. The two converters have their own start, stop, sync, end-of-scan interrupt enable
controls, and end-of-scan interrupts. Scanning in either converter terminates only when that converter
encounters a disabled sample in its part of SDIS register (DS0-DS3 for A, DS4-DS7 for B).
Figure 26-19. Parallel Mode Operation of the ADC
The ADC can be configured to perform a single scan and halt, perform a scan when triggered, or perform
the scan sequence repeatedly until manually stopped. The single scan (once mode) differs from the
triggered mode only in that SYNC input signals must be re-armed after each using a once mode scan, and
subsequent SYNC inputs are ignored until the SYNC input is re-armed. This arming can occur anytime
after the SYNC pulse occurs, even while the scan it initiated remains in process.