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DSP56857 Datasheet(PDF) 288 Page - Freescale Semiconductor, Inc

No. de pieza DSP56857
Descripción Electrónicos  Digitial Signal Controller
PDF  662 Pages
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Fabricante Electrónico  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 Datasheet(HTML) 288 Page - Freescale Semiconductor, Inc

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Error Conditions
5685X Digital Signal Controller User Manual, Rev. 4
11-18
Freescale Semiconductor
Figure 11-11. Missed Read of Overflow Condition
In this case, an overflow can easily be missed. Since no more SPRF interrupts can be generated
until this OVRF is serviced, it is not obvious data is being lost as more transmissions are
completed. To prevent this loss, either enable the OVRF interrupt or take another read of the
SPSCR following the read of the SPDRR. This ensures the OVRF was not set before the SPRF
was cleared. Future transmissions can set the SPRF bit. Figure 11-11 illustrates the described
process. Generally, to avoid a second SPSCR read, enable the OVRF to the core by setting the
ERRIE bit.
READ SPDRR
READ SPSCR
OVRF
SPRF
DATA 1
DATA 2
DATA 3
DATA 4
DATA 1 SETS SPRF BIT.
DSC READS SPSCR WITH SPRF BIT
DSC READS DATA 1 IN SPDRR,
DATA 2 SETS SPRF BIT.
DSC READS SPSCR WITH SPRF BIT SET
DATA 3 SETS OVRF BIT. DATA 3 IS LOST.
DSC READS DATA 2 IN SPDRR, CLEARING SPRF
DATA 4 FAILS TO SET SPRF BIT BECAUSE
1
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
CLEARING SPRF BIT.
BIT BUT NOT THE OVRF BIT.
OVRF BIT IS NOT CLEARED. DATA 4 IS LOST.
SET AND OVRF BIT CLEAR.
AND OVRF BIT CLEAR.



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