Renesas H8S/2318 series, Hardware Manual

Page: 784 / 1121

Rev. 5.00, 12/03, page 754 of 1088
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
User Boot MAT Blank Check
The boot program will check whether or not all user boot MATs are blank and return the result.
Command H'4C
•
Command, H'4C, (1 byte): Blank check for user boot MAT
Response H'06
•
Response, H'06, (1 byte): Response to the blank check of user boot MAT
If all user MATs are blank (H'FF), the boot program will return ACK.