R5F72115D160FPV datasheet(982/1228 Pages) RENESAS

982 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 958 of 1200

REJ09B0344-0200

(f)

Inquiry on Operating Frequency

In response to the inquiry on operating frequency, the boot program returns the number of

operating frequencies and the maximum and minimum values.

Command

H'23

• Command H'23 (1 byte): Inquiry on operating frequency

Response

H'33

Size

Number of operating clocks

Operating freq. (min)

Operating freq. (max)

…

SUM

• Response H'33 (1 byte): Response to the inquiry on operating frequency

• Size (1 byte): The total length of the number of operating clocks, and maximum and minimum

values of operating frequency fields.

• Number of operating clocks (1 byte): The number of operating clock frequencies required

within the device.

For example, the value two indicates main and peripheral operating clock frequencies.

• Minimum value of operating frequency (2 bytes): The minimum frequency of a frequency-

multiplied or -divided clock signal.

The value in this field and in the maximum value field is the frequency in MHz to two decimal

places, multiplied by 100 (for example, if the frequency is 20.00 MHz, the value multiplied by

100 is 2000, so H'07D0 is returned here).

• Maximum value of operating frequency (2 bytes): The maximum frequency of a frequency-

multiplied or -divided clock signal.

As many pairs of minimum/maximum values are included as there are operating clocks.

• SUM (1 byte): Checksum

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