D12320VF25V Datasheet, PDF (808/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
Erasure
Erasure is performed with the erasure selection and block erasure command.
Firstly, erasure is selected by the erasure selection command and the boot program then erases the
specified block. The command should be repeatedly executed if two or more blocks are to be
erased. Sending a block-erasure command from the host with the block number H'FF will stop the
erasure operating. On completion of erasing, the boot program will wait for selection of
programming or erasing.
The sequences of the issuing of erasure selection commands and the erasure of data are shown in
figure 17.87.
Host
Repeat
Preparation for Erasure (H'48)
Boot Program
Transfer of Erasure
Program
ACK
Erasure (Erased Block Number)
ACK
Erasure
Erasure (H'FF)
ACK
Figure 17.87 Erasure Sequence
(1) Erasure Selection
The boot program will transfer the erasure program. User MAT data is erased by the transferred
erasure program.
Command H'48
• Command, H'48, (1 byte): Erasure selection
Response H'06
• Response, H'06, (1 byte): Response for erasure selection
After the erasure program has been transferred, the boot program will return ACK.
Rev.7.00 Feb. 14, 2007 page 774 of 1108
REJ09B0089-0700