R8C datasheet(162/199 Pages) RENESAS

162 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 152 of 180

REJ09B0019-0120

Write ‘D016’ to the given block

address

Start

Block erase completed

YES

Write the command code ‘2016’

FMR00=1?

Full status check

Figure 17.10 Block Erase Flow Chart (When Not Using Erase-suspend Function)

• Block Erase

Write ‘2016’ in the first bus cycle and write ‘D016’ to the given address of a block in the second bus

cycle, and an auto erase operation (erase and verify) will start.

Check the FMR00 bit in the FMR0 register to see if auto erasing has finished.

The FMR00 bit is “0” during auto erasing and set to “1” when auto erasing is completed.

Check the FMR07 bit in the FMR0 register after auto erasing has finished, and the result of auto

erasing can be known. (Refer to Section 17.4.5, “Full Status Check.”)

When the FMR02 bit in the FMR0 register is set to “0” (rewrite disabled), the Block Erase command

on the Block0 and Block1 is not accepted.

Figure 17.10 shows an example of a block erase flowchart when the erase-suspend function is not

used. Figure 17.11 shows an example of a block erase flowchart when the erase-suspend function is

used.

In EW1 mode, do not execute this command on any address at which the rewrite control program is

located.

In EW0 mode, the microcomputer goes to read status register mode at the same time auto erasing

starts, making it possible to read the status register. The status register bit 7 (SR7) is cleared to “0” at

the same time auto erasing starts, and set back to “1” when auto erasing finishes. In this case, the

microcomputer remains in read status register mode until the Read Array command is written next.

17.4 CPU Rewrite Mode

R8C 데이터시트(PDF) 162 Page - Renesas Technology Corp