R5F72115D160FPV datasheet(978/1228 Pages) RENESAS

978 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 954 of 1200

REJ09B0344-0200

The selection commands should be sent by the host in this order: device selection (H'10), clock-

mode selection (H'11), new bit rate selection (H'3F). These commands are mandatory. If the same

selection command is sent two or more times, the command that is sent last is effective.

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.

(a)

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

Size

No. of devices

Number of

characters

Device code

Product name

…

SUM

• 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 microcontroller.

• 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.

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