Renesas H8S/2318 series, Hardware Manual

Page: 781 / 1121

Rev. 5.00, 12/03, page 751 of 1088
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.
Transfer of Erasure
Program
Host Boot Program
Preparation for Erasure (H'48)
ACK
Erasure
Erasure (Erased Block Number)
Erasure (H'FF)
ACK
ACK
Repeat
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.