H8SXSLASH1663M datasheet(1214/1504 Pages) RENESAS

1214 / 1504 page

Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1182 of 1468

REJ09B0412-0200

(e)

Multiplication Ratio Inquiry

The boot program will return the supported multiplication and division ratios.

Command

H'22

• Command, H'22, (one byte): Inquiry regarding multiplication ratio

Response

H'32

Size

Number

of types

multipli

cation

Number of

multiplication ratios

Multiplica-

tion ratio

···

SUM

• Response, H'32, (one byte): Response to the multiplication ratio inquiry

• Size (one byte): The amount of data that represents the number of types of multiplication, the

number of multiplication ratios, and the multiplication ratios

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

the device can be set

(e.g. when there are two multiplied clock types, which are the main and peripheral clocks, the

number of types will be H'02.)

• Number of multiplication ratios (one byte): The number of types of multiplication ratios for

each type

(e.g. the number of multiplication ratios to which the main clock can be set and the peripheral

clock can be set.)

• Multiplication ratio (one byte)

Multiplication ratio: The value of the multiplication ratio (e.g. when the clock-frequency

multiplier is four, the value of multiplication ratio will be H'04.)

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

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

The number of multiplication ratios returned is the same as the number of multiplication ratios

and as many groups of data are returned as there are types of multiplication.

• SUM (one byte): Checksum

H8SX/1663M Datasheet(PDF) 1214 Page - Renesas Technology Corp