Example Of Block Erase Operation In Self Programming Mode - NEC 78K0S/KB1+ User Manual

19.8.6 Example of block erase operation in self programming mode

An example of the block erase operation in self programming mode is explained below.
<1> Set 03H (block erase) to the flash program command register (FLCMD).
<2> Set the block number to be erased, to flash address pointer H (FLAPH).
<3> Set flash address pointer L (FLAPL) to 00H.
<4> Write the same value as FLAPH to the flash address pointer H compare register (FLAPHC).
<5> Set the flash address pointer L compare register (FLAPLC) to 00H.
<6> Clear the flash status register (PFS).
<7> Write ACH to the watchdog timer enable register (WDTE) (clear and restart the watchdog timer counter)
<8> Execute the HALT instruction then start self programming. (Execute an instruction immediately after the
HALT instruction if self programming has been executed.)
<9> Check if a self programming error has occurred using bit 1 (VCERR) and bit 2 (WEPRERR) of PFS.
Abnormal → <10>
→ <11>
Normal
<10> Block erase processing is abnormally terminated.
<11> Block erase processing is normally terminated.
Note This setting is not required when the watchdog timer is not used.
CHAPTER 19 FLASH MEMORY
User's Manual U17446EJ3V1UD
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