D12320VF25V Datasheet, PDF (791/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
One-Byte Command
or One-Byte Response
n-Byte Command or
n-Byte Response
Error Response
128-Byte Programming
Memory Read
Response
Command or Response
Data
Size
Command or Response
Error Code
Error Response
Address
Command
Data (n bytes)
Size
Response
Data
Checksum
Checksum
Checksum
Figure 17.84 Communication Protocol Format
• Command (1 byte): Commands including inquiries, selection, programming, erasing, and
checking
• Response (1 byte): Response to an inquiry
• Size (1 byte): The amount of data for transmission excluding the command, amount of data,
and checksum
• Checksum (1 byte): The checksum is calculated so that the total of all values from the
command byte to the SUM byte becomes H'00
• Data (n bytes): Detailed data of a command or response
• Error Response (1 byte): Error response to a command
• Error Code (1 byte): Type of the error
• Address (4 bytes): Address for programming
• Data (n bytes): Data to be programmed (the size is indicated in the response to the
programming unit inquiry.)
• Size (4 bytes): Four-byte response to a memory read
Rev.7.00 Feb. 14, 2007 page 757 of 1108
REJ09B0089-0700