SH7080_09 Datasheet, PDF (1348/1622 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family

Section 23 Flash Memory
All commands in the above table, except for the boot program state inquiry command (H'4F), are
valid until the boot program accepts the transition-to-programming/erasure state command (H'40).
That is, until the transition command is accepted, the host can continue to send commands listed in
the above table until it has made the necessary inquiries and selections. The host can send the boot
program state inquiry command (H'4F) even after acceptance of the transition-to-
programming/erasure state command (H'40) by the boot program.
(1) Inquiry on supported devices
In response to the inquiry on supported devices, the boot program returns the device codes of the
devices it supports and the product names of their respective boot programs.
Command H'20
⎯ Command H'20 (1 byte): Inquiry on supported devices
Response
H'30
Number of
characters
…
SUM
Size
Device code
No. of devices
Product name
⎯ Response H'30 (1 byte): Response to the inquiry on supported devices
⎯ Size (1 byte): The length of data for transfer excluding the command code, this field (size),
and the checksum. Here, it is the total number of bytes taken up by the number of devices,
number of characters, device code, and product name fields.
⎯ Number of devices (1 byte): The number of device models supported by the boot program
embedded in the microcomputer.
⎯ Number of characters (1 byte): The number of characters in the device code and product
name fields.
⎯ Device code (4 bytes): Device code of a supported device (ASCII encoded)
⎯ Product name (n bytes): Product code of the boot program (ASCII encoded)
⎯ SUM (1 byte): Checksum
This is set so that the total sum of all bytes from the command code to the checksum is
H'00.
Rev. 4.00 Dec. 15, 2009 Page 1288 of 1558
REJ09B0181-0400