SH7146 Datasheet, PDF (867/1022 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 19 Flash Memory
• Erasure
Erasure is performed by issuing the erasure selection command and then one or more block
erasure commands.
Firstly, the host sends the erasure selection command to select erasure; after that, it sends a block
erasure command to actually erase a specific block. To erase multiple blocks, send further block
erasure commands. To terminate erasure, the host should send a block erasure command with the
block number H'FF. After this, the boot program waits for the next programming/erasure selection
command.
The sequence of erasure by the erasure selection command and block erasure command is shown
in figure 19.26.
Host
Erasure selection (H'48)
ACK
Boot program
Transfer the
program that
performs erasure
Repeat
Erasure (block number)
ACK
Erasure
Erasure (H'FF)
ACK
Figure 19.26 Sequence of Erasure
Rev. 3.00 May 17, 2007 Page 823 of 974
REJ09B0229-0300