UPSD3422_06 Datasheet, PDF (208/293 Pages) STMicroelectronics – Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic

PSD module
uPSD34xx
the 8032 should test the Toggle Flag Bit (DQ6) again, since the Toggle Flag Bit (DQ6) may
have changed simultaneously with the Error Flag Bit (DQ5) (see Figure 73).
The Error Flag Bit (DQ5) is set if either an internal time-out occurred while the embedded
algorithm attempted to program the byte, or if the 8032 attempted to program bit to logic ’1’
when that bit was already programmed to logic ’0’ (must erase to achieve logic ’1’).
It is suggested (as with all Flash memories) to read the location again after the embedded
programming algorithm has completed, to compare the byte that was written to Flash
memory with the byte that was intended to be written.
When using the Data Toggle method during an erase operation, Figure 73 still applies. the
Toggle Flag Bit (DQ6) toggles until the erase operation is complete. A ’1’ on the Error Flag
Bit (DQ5) indicates a time-out condition on the Erase cycle, a ’0’ indicates no error. The
8032 can read any location within the sector being erased to get the Toggle Flag Bit (DQ6)
and the Error Flag Bit (DQ5).
PSDsoft Express generates ANSI C code functions the user may use to implement these
Data Toggling algorithms.
Figure 73. Data toggle flowchart
START
READ
DQ5 & DQ6
DQ= 6
NO
TOGGLE
YES
NO _DQ5
=1
YES
READ DQ6
DQ= 6
NO
TOGGLE
YES
FAIL
PASS
AI01370B
28.5.12
Ready/Busy (PC3)
This signal can be used to output the Ready/Busy status of a program or erase operation on
either Flash memory. The output on the Ready/Busy pin is a ’0’ (Busy) when either Flash
memory array is being written, or when either Flash memory array is being erased. The
output is a ’1’ (Ready) when no program or erase operation is in progress. To activate this
function on this pin, the user must select the “Ready/Busy” selection in PSDsoft Express
when configuring pin PC3. This pin may be polled by the 8032 or used as a 8032 interrupt to
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