MPC564EVB Freescale Semiconductor, MPC564EVB Datasheet - Page 595
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MPC564EVB
Manufacturer Part Number
MPC564EVB
Description
KIT EVAL FOR MPC561/562/563/564
Manufacturer
Freescale Semiconductor
Type
Microcontrollerr
Specifications of MPC564EVB
Contents
Module Board, Installation Guide, Power Supply, Cable, Software and more
Processor To Be Evaluated
MPC56x
Data Bus Width
32 bit
Interface Type
RS-232, Ethernet
For Use With/related Products
MPC561, 562, 563, 564
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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32-bit accesses to an even address require two bus cycles to complete the access, and two full 16-bit
QADC64E locations are accessed. The first bus cycle reads or writes the addressed 16-bit QADC64E
location and the second cycle reads or writes the following 16-bit location.
32-bit accesses to an odd address require three bus cycles. Portions of three different QADC64E locations
are accessed. The first bus cycle is treated by the QADC64E as an 8-bit access of an odd address, the
second cycle is a 16-bit aligned access, and the third cycle is an 8-bit access of an even address. The
QADC64E address space is organized into 16-bit even address locations, so a 32-bit read or write of an
odd address provides the lower half of one QADC64E location, the full 16-bit content of the following
QADC64E location, and the upper half of the third QADC64E location.
14.5
This section contains examples describing queue priority and conversion timing schemes.
14.5.1
Since there are two conversion command queues and only one A/D converter, there is a priority scheme
to determine which conversion is to occur. Each queue has a variety of trigger events that are intended to
initiate conversions, and they can occur asynchronously in relation to each other and other conversions in
progress. For example, a queue can be idle awaiting a trigger event, a trigger event can have occurred but
the first conversion has not started, a conversion can be in progress, a pause condition can exist awaiting
another trigger event to continue the queue, and so on.
The following paragraphs and figures outline the prioritizing criteria used to determine which conversion
occurs in each overlap situation.
Trigger events are described in
Freescale Semiconductor
Trigger and Queue Interaction Examples
Queue Priority Schemes
The situations in
S19. In each diagram, time is shown increasing from left to right. The
execution of queue 1 and queue 2 (Q1 and Q2) is shown as a string of
rectangles representing the execution time of each CCW in the queue. In
most of the situations, there are four CCWs (labeled C1 to C4) in both queue
1 and queue 2. In some of the situations, CCW C2 is presumed to have the
pause bit set, to show the similarities of pause and end-of-queue as
terminations of queue execution.
Trigger
T1
T2
Table
Figure 14-25
MPC561/MPC563 Reference Manual, Rev. 1.2
Events that trigger queue 1 execution (external trigger, software
initiated single-scan enable bit, or completion of the previous
continuous loop)
Events that trigger queue 2 execution (external trigger, software
initiated single-scan enable bit, timer period/interval expired, or
completion of the previous continuous loop)
14-23.
Table 14-23. Trigger Events
through
NOTE
Figure 14-43
Events
are labeled S1 through
QADC64E Enhanced Mode Operation
14-53
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