H8SXSLASH1663M datasheet(1218/1504 Pages) RENESAS

1218 / 1504 page

Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1186 of 1468

REJ09B0412-0200

(k)

New Bit-Rate Selection

The boot program will set a new bit rate and return the new bit rate.

This selection should be sent after sending the clock mode selection command.

Command

H'3F

Size

Bit rate

Input frequency

Number of types of

multiplication

Multiplication

ratio 1

Multiplication

ratio 2

SUM

• Command, H'3F, (one byte): Selection of new bit rate

• Size (one byte): The number of bytes that represents the bit rate, input frequency, number of

types of multiplication, and multiplication ratio

• Bit rate (two bytes): New bit rate

One hundredth of the value (e.g. when the value is 19200 bps, it will be 192, which is H'00C0.)

• Input frequency (two bytes): Frequency of the clock input to the boot program

This is valid to the hundredths place and represents the value in MHz multiplied by 100. (E.g.

when the value is 20.00 MHz, it will be 2000, which is H'07D0.)

• Number of types of multiplication (one byte): The number of multiplication to which the

device can be set.

• Multiplication ratio 1 (one byte): The value of multiplication or division ratios for the main

operating frequency

Multiplication ratio (one byte): The value of the multiplication ratio (e.g. when the clock

frequency is multiplied by four, the multiplication ratio will be H'04.)

Division ratio: The inverse of the division ratio, as a negative number (e.g. when the clock

frequency is divided by two, the value of division ratio will be H'FE. H'FE = D'-2)

• Multiplication ratio 2 (one byte): The value of multiplication or division ratios for the

peripheral frequency

Multiplication ratio (one byte): The value of the multiplication ratio (e.g. when the clock

frequency is multiplied by four, the multiplication ratio will be H'04.)

(Division ratio: The inverse of the division ratio, as a negative number (E.g. when the clock is

divided by two, the value of division ratio will be H'FE. H'FE = D'-2)

• SUM (one byte): Checksum

Response

H'06

• Response, H'06, (one byte): Response to selection of a new bit rate

When it is possible to set the bit rate, the response will be ACK.

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