H8SSLASH2218 datasheet(624/750 Pages) RENESAS

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Section 17 Flash Memory (F-ZTAT Version)

Rev.6.00 Jun. 03, 2008 Page 576 of 698

REJ09B0074-0600

17.6.3

Programming/Erasing in User Program Mode

On-board programming/erasing of an individual flash memory block can also be performed in user

program mode by branching to a user program/erase control program. The user must set branching

conditions and provide on-board FWE control and supply of programming data, and storing a

program/erase control program in part of the program area as necessary. The flash memory must

contain the user program/erase control program or a program which provides the user

program/erase control program from external memory. Because the flash memory itself cannot be

read during programming/erasing, transfer the user program/erase control program to on-chip

RAM, as like in boot mode. Figure 17.9 shows a sample procedure for programming/erasing in

user program mode. Prepare a user program/erase control program in accordance with the

description in section 17.8, Flash Memory Programming/Erasing.

Yes

Program/erase?

Transfer user program /erase

control program to RAM

Branch to user program/erase

control in RAM

Execute user program/erase

control pogram (flash memory rewrite)

Branch to flash memory

application program

Branch to flash memory

application program

MD2 to MD0 = 110,111 Reset start

Figure 17.9 Programming/Erasing Flowchart Example in User Program Mode

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