M16CSLASH1N datasheet(203/238 Pages) RENESAS

203 / 238 page

Rev.1.00

Oct 20, 2004

page 191 of 222

M16C/1N Group

19. Flash Memory Version

REJ09B0007-0100Z

Figure 19.11 Block erase flowchart (when using the erasure suspend feature)

Write ’xxD016’ to uppermost block

address (Note1)

FMR40=1

FMR41=1

FMR41=0

Start

Block erase completed

YES

Write the command code ’xx2016’

(Note 1)

Access to flash memory

FMR00=1?

Full status check (Note 2, 3)

Interrupt (Note 4)

REIT

YES

FMR46=1?

Access to flash memory

Interrupt (Note 4)

REIT

Write ’xxD016’ to the uppermost

block address (Note 1)

Start

(EW1 mode)

(EW0 mode)

Block erase completed

YES

Write the command code ’xx2016’

(Note 1)

FMR00=1?

FMR40=1

FMR41=0

Full status check (Note 2, 3)

Note 1: Write the command code and data at even number.

Note 2: See Figure 19.12 Full status check flowchart, handling each error generated.

Note 3: When the erase error occurred, repeat the operation executing the clear status register

command and then the block erase command in succession at least 3 times until the error is

eliminated.

Note 4: In EW0 mode, allocate the interrupt vector table of used interrupt to the internal RAM.

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