SH7125 Datasheet, PDF(648/782 Page) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer

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SH7125 Datasheet, PDF (648/782 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer

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Section 17 Flash Memory

One-character command

or one-character response

n-character command

or n-character response

Error response

Command or response

Data

Size

Command or response

Error code

Error response

Checksum

128-byte

programming command

Response to

memory read command

Address

Command

Data size

Response

Data (n bytes)

Data

Checksum

Checksum

Figure 17.17 Formats in the Communications Protocol

ï£§ Command (1 byte): Inquiry, selection, programming, erasure, checking, etc.

ï£§ Response (1 byte): Response to an inquiry

ï£§ Size (one or two bytes): The length of data for transfer, excluding the command/response

code, size, and checksum.

ï£§ Data (n bytes): Particular data for the command or response

ï£§ Checksum (1 byte): Set so that the total sum of byte values from the command code to the

checksum and change lower one byte to H'00.

ï£§ Error response (1 byte): Error response to a command

ï£§ Error code (1 byte): Indicates the type of error.

ï£§ Address (4 bytes): Address for programming

ï£§ Data (n bytes): Data to be programmed. "n" is known from the response to the command

used to inquire about the programming size.

ï£§ Data size (4 bytes): Four-byte field included in the response to a memory reading

command.

Rev. 3.00 Sep. 27, 2007 Page 628 of 758

REJ09B0243-0300

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