Motorola ColdFire MCF5281 - Manual (Page 568)

Queued Analog-to-Digital Converter (QADC)
28-30 Freescale Semiconductor
Figure 28-18. External Multiplexing Configuration
When externally multiplexed mode is selected, the QADC automatically drives the MA output signals
from the channel number in each CCW. The QADC also converts the proper input channel (ANW, ANX,
ANY, and ANZ) by interpreting the CCW channel number. As a result, up to 16 externally multiplexed
channels appear to the conversion queues as directly connected signals. User software simply puts the
channel number of externally multiplexed channels into CCWs.
AN52/MA0/PQA0
AN53/MA1/PQA1
AN55/ETRIG1PQA3
AN56/ETRIG2/PQA4
AN0/ANW/PQB0
AN1/ANX/PQB1
AN2/ANY/PQB2
AN3/ANZ/PQB3
Po
rt
Q
B
Po
rt
Q
A
AN0
AN2
AN4
AN6
AN1
AN3
AN5
AN7
AN16
AN18
AN20
AN22
AN17
AN19
AN21
AN23
MUX
MUX
MUX
MUX
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3