Datasheet

Section 7 ROM
Page 178 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
5. Response to a memory read command
This response includes 4-byte size information.
One-character command
or one-character response
Command or response
n-character command
or n-character response
Error response
128-byte
programming command
Response to memory
read command
Data
Programming address Programming data (128 bytes)
Data size Data
Checksum
Checksum
Checksum
Data size
Command or response
Command
Response
Error response
Error code
Response to erasure
block information
inquiry command
Data
Checksum
Size
Command
Figure 7.8 Formats in Communication Protocol
• Command (1 byte): Inquiry, selection, programming, erasure, checking, etc.
• Response (1 byte): Response to an inquiry
• Size (1 or 2 bytes): The size of transmit/receive data excluding the command code, response,
size, and checksum, or the size of data in a response to erasure block information inquiry
command
• Data (n bytes): Particular data for a command or response
• Checksum (1 byte): This is set so that the total sum of the values from the command- code
field or response through the SUM field should be H'00.
• Error response (1 byte): Error response to a command
• Error code (1 byte): Type of an error that has occurred
• Programming address (4 bytes): Address for programming
• Programming data (n bytes): Data for programming. "n" is known from the response to the
programming-size inquiry command. (Data size for this LSI is fixed 128 bytes.)