H8SXSLASH1663 datasheet(990/1158 Pages) RENESAS

990 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 938 of 1102

REJ09B0294-0100

(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

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 clock sources and

multiplication ratios and the multiplication ratios

• Number of types (one byte): The number of supported multiplied clock types

(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 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 = D'-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.

• SUM (one byte): Checksum

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