Datasheet

Section 19 Flash Memory
Rev. 3.00 Sep. 28, 2009 Page 580 of 710
REJ09B0384-0300
The selection commands, which are device selection (H'10), clock mode selection (H'11), and new
bit rate selection (H'3F), should be sent from the host in that order. These commands will certainly
be needed. When two or more selection commands are sent at once, the last command will be
valid.
All of these commands, except for the boot program status inquiry command (H'4F), will be valid
until the boot program receives the programming/erasing transition (H'40). The host can choose
the needed commands out of the commands and inquiries listed above. The boot program status
inquiry command (H'4F) is valid after the boot program has received the programming/erasing
transition command (H'40).
(a) Supported Device Inquiry
The boot program will return the device codes of supported devices and the product code in
response to the supported device inquiry.
Command H'20
• Command, H'20, (1 byte): Inquiry regarding supported devices
Response H'30 Size Number of devices
Number of
characters
Device code Product name
···
SUM
• Response, H'30, (1 byte): Response to the supported device inquiry
• Size (1 byte): Number of bytes to be transmitted, excluding the command, size, and
checksum, that is, the amount of data contributes by the number of devices, characters, device
codes and product names
• Number of devices (1 byte): The number of device types supported by the boot program
• Number of characters (1 byte): The number of characters in the device codes and boot
program’s name
• Device code (4 bytes): ASCII code of the supporting product
• Product name (n bytes): Type name of the boot program in ASCII-coded characters
• SUM (1 byte): Checksum
The checksum is calculated so that the total number of all values from the command byte to
the SUM byte becomes H'00.