HD64F3670 Datasheet, PDF (110/323 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

6. If the read data is not erased successfully, set erase mode again, and repeat the erase/erase-
verify sequence as before. The maximum number of repetitions of the erase/erase-verify
sequence is 100.
7.4.3 Interrupt Handling when Programming/Erasing Flash Memory
All interrupts, including the 10, interrupt, are disabled while flash memory is being programmed
or erased, or while the boot program is executing, for the following three reasons:
1. Interrupt during programming/erasing may cause a violation of the programming or erasing
algorithm, with the result that normal operation cannot be assured.
2. If interrupt exception handling starts before the vector address is written or during
programming/erasing, a correct vector cannot be fetched and the CPU malfunctions.
3. If an interrupt occurs during boot program execution, normal boot mode sequence cannot be
carried out.
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