XC886/888CLM
Analog-to-Digital Converter
User’s Manual
16-11
V1.3, 2010-02
ADC, V 1.0
16.4.4
Sequential Request Source
A sequential request source requests one conversion after the other. The amount of
channels requested for conversion depends on the length of the sequential buffer queue
(number of queue stages).
The sequential source register description can be found in
16.4.4.1
Overview
The sequential request source at arbitration slot 0 requests one conversion after another
for channel numbers between 0 and 7. The queue stage stores the requested channel
number and some additional control information. As a result, the order in which the
channels are to be converted is freely programmable without restrictions in the
sequence. The additional control information is used to enable the request source
interrupt (when the requested channel conversion is completed) and to enable the
automatic refill process.
A sequential source consists of 4 queue stages, one backup stage (QBUR0) and a mode
control register (QMR0). The backup stage stores the information about the latest
conversion requested after it has been aborted. If the backup register contains an
aborted request (V = 1), it is treated before the entries in the queue stage. This implies
that only the bit V in the backup register is cleared when the requested conversion is
started. If the bit V in the backup register is not set, the bit V in the queue stage 0 is reset
when the requested conversion is started. The request source can take part in the
source arbitration if the backup stage or queue stage contains a valid request (V = 1).
Note: Of the 4 queue stages, only the register queue 0 can be read, the register of the
other stages are internal.
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