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8.3.3.3
Flash Operation Timer Function
The flash control module has an operation timer. The count value of the flash operation timer uses the system clock as
its clock source. The count value of the flash operation timer must be less than the upper limit of the flash operation timer,
and is greater than zero, then operations can be performed on flash memory, or a 32-bit/16-bit data can be written to target
address. If a flash operation is initiated, which means when STRT@FLASH_CR bit is set to 1 or write operation to flash is
initiated, the flash operation timer count value is not in the valid time window, then the flash operation cannot be performed
and PGWERR@FLASH_SR bit is set to 1. For detailed usage of flash operation timer, see the figure below:
Is the FLASH_CNT within the valid range of the
time window? (Perform by hardware)
BSY@FLASH_SR =0？
Yes
No
Set the FLASH_CNT window
counter, set the FLASH_UPCNT
counter upper CNTEN@CNTCR = 1
Start
……
FLASH erase/program
operation setting
STRT@FLASH_CR = 1
Or the data is written to the desired
address
Yes
End
No
OPERR@FLASH_SR = 1
（Perform by hardware）
Perform flash erase/program sub-
operation (Perform by hardware )
Figure8-3
Flash Operation Timer Flowchart



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