R5F72115D160FPV datasheet(981/1228 Pages) RENESAS

981 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 957 of 1200

REJ09B0344-0200

(e)

Inquiry on Frequency Multipliers

In response to the inquiry on frequency multipliers, the boot program returns information on the

settable frequency multipliers or divisors.

Command

H'22

• Command H'22 (1 byte): Inquiry on frequency multipliers

Response

H'32

Size

Number of

operating clocks

No. of multipliers

Multiplier

…

SUM

• Response H'32 (1 byte): Response to the inquiry on frequency multipliers

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

multiplier fields.

• Number of operating clocks (1 byte): The number of operating clocks for which multipliers

can be selected

(for example, if frequency multiplier settings can be made for the frequencies of the main and

peripheral operating clocks, the value should be H'02).

• Number of multipliers (1 byte): The number of multipliers selectable for the operating

frequency of the main or peripheral modules

• Multiplier (1 byte):

Multiplier: Numerical value in the case of frequency multiplication (e.g. H'04 for

×4)

Divisor: Two’s complement negative numerical value in the case of frequency division (e.g.

H'FE [-2] for

×1/2)

As many multiplier fields are included as there are multipliers or divisors, and combinations of

the number of multipliers and multiplier fields are repeated as many times as there are

operating clocks.

• SUM (1 byte): Checksum

R5F72115D160FPV Datasheet(PDF) 981 Page - Renesas Technology Corp