D12320VF25V Datasheet, PDF (811/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
H'2A: Address error
The read address is not in the MAT.
H'2B: Size error
The read size exceeds the MAT.
User-Boot Program Sum Check
The boot program will return the byte-by-byte total of the contents of the bytes of the user-boot
program.
Command H'4A
• Command, H'4A, (1 byte): Sum check for user-boot program
Response H'5A Size Checksum of user boot program SUM
• Response, H'5A, (1 byte): Response to the sum check of user-boot program
• Size (1 byte): The number of bytes that represents the checksum
This is fixed to 4.
• Checksum of user boot program (4 bytes): Checksum of user boot MATs
The total of the data is obtained in byte units.
• SUM (1 byte): Sum check for data being transmitted
User-Program Sum Check
The boot program will return the byte-by-byte total of the contents of the bytes of the user
program.
Command H'4B
• Command, H'4B, (1 byte): Sum check for user program
Response H'5B Size Checksum of user program SUM
• Response, H'5B, (1 byte): Response to the sum check of the user program
• Size (1 byte): The number of bytes that represents the checksum
This is fixed to 4.
• Checksum of user boot program (4 bytes): Checksum of user MATs
The total of the data is obtained in byte units.
• SUM (1 byte): Sum check for data being transmitted
Rev.7.00 Feb. 14, 2007 page 777 of 1108
REJ09B0089-0700