H8SXSLASH1663 datasheet(987/1158 Pages) RENESAS

987 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 935 of 1102

REJ09B0294-0100

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. 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 and make inquiries while the above commands are being transmitted. H'4F

is valid even after the boot program has received 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, (one byte): Inquiry regarding supported devices

Response

H'30

Size

Number of devices

Number of

characters

Device code

Product name

···

SUM

• Response, H'30, (one byte): Response to the supported device inquiry

• Size (one 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 (one byte): The number of device types supported by the boot program

• Number of characters (one byte): The number of characters in the device codes and boot

program's name

• Device code (four bytes): ASCII code of the supporting product

• Product name (n bytes): Type name of the boot program in ASCII-coded characters

• SUM (one 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.

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