H8SXSLASH1663 datasheet(991/1158 Pages) RENESAS

991 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 939 of 1102

REJ09B0294-0100

(f)

Operating Clock Frequency Inquiry

The boot program will return the number of operating clock frequencies, and the maximum and

minimum values.

Command

H'23

• Command, H'23, (one byte): Inquiry regarding operating clock frequencies

Response

H'33

Size

Number of operating

clock frequencies

Minimum value of

operating clock frequency

Maximum value of operating clock

frequency

···

SUM

• Response, H'33, (one byte): Response to operating clock frequency inquiry

• Size (one byte): The number of bytes that represents the minimum values, maximum values,

and the number of frequencies.

• Number of operating clock frequencies (one byte): The number of supported operating clock

frequency types

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

clocks, the number of types will be H'02.)

• Minimum value of operating clock frequency (two bytes): The minimum value of the

multiplied or divided clock frequency.

The minimum and maximum values of the operating clock frequency represent the values in

MHz, valid to the hundredths place of MHz, and multiplied by 100. (e.g. when the value is

17.00 MHz, it will be 2000, which is H'07D0.)

• Maximum value (two bytes): Maximum value among the multiplied or divided clock

frequencies.

There are as many pairs of minimum and maximum values as there are operating clock

frequencies.

• SUM (one byte): Checksum

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