32186 datasheet(181/1032 Pages) RENESAS

181 / 1032 page

INTERNAL MEMORY

6-39

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Figure 6.6.11 Block Erase

6.6 Programming Internal Flash Memory

(4) Block Erase command

The Block Erase command erases the content of the internal flash memory one block at a time. To perform

this operation, write the command data (H’2020) to any address of the internal flash memory. Next, write the

Verify command (H’D0D0) to the last even address of the flash memory block to be erased (see Table 6.6.3,

“Target Blocks and Specified Addresses”).

The protected flash memory blocks cannot be erased by the Block Erase command.

Block erase operation is automatically performed by the internal control circuit, and whether the Block Erase

command has finished can be known by checking the Flash Status Register (FSTAT) FBUSY (Flash busy)

bit. While the FBUSY bit = "0," the next block erase operation cannot be performed.

END

START

Write the Verify command (H'D0D0) to

the last even address of the flash

memory block to be erased

Write the Block Erase command

(H'2020) to any address of the

internal flash memory

Internal flash memory contents

are erased by the Block Erase

command

Wait for 1 µs

(using a hardware or software timer)

TIME OUT?

YES

Forcibly terminated

YES

Confirm the result of execution

of the erase process

(Note 1)

FBUSY bit = 1

Note 1: Check Flash Status Register (FSTAT) ERASE bit (for the erase status) and WRERR bit (for the write status).

32186 Datasheet(PDF) 181 Page - Renesas Technology Corp