M32CSLASH8B datasheet(334/406 Pages) RENESAS

334 / 406 page

Under development

M32C/8B Group

23. Flash Memory

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 317 of 385

(9) Read Protect Bit Status Command

The read protect bit status command reads a protect bit status of a given block.

Execute the read protect bit status command by the program placed in the RAM. By writing xx61h in the first

bus cycle and reading the protect bit address of the specified block in the second bus cycle, the protect bit status

of the block can be read by the bit 6 of the read data. When the bit 6 is 0 (protected), the flash memory is

protected by the specified protect bit; when the bit 6 is 1 (unprotected), the flash memory is not protected by the

specified protect bit. Figure 23.14 shows a flow chart of read protect bit status command. The flash memory

enters read protect bit status mode after this command is executed. A protect bit status can be read in succession

by reading a protect bit address.

Figure 23.14

Read Protect Bit Status Command

Start

End

Read the bit 6 of the read data

Write the command code xx61h

Read the protect bit address

Write command code to an even address.

Write by a program placed in the RAM.

M32C/8B Datasheet(PDF) 334 Page - Renesas Technology Corp