SH7125_08 Datasheet, PDF (655/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Flash Memory
(5) 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
No. of multipliers Multiplier
…
SUM
No. of frequency
types
…
 Response H'32 (1 byte): Response to the inquiry on frequency multipliers
 Size (1 byte): The total length of the number of frequency types, number of multipliers, and
multiplier fields.
 Number of frequency types (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 frequency types are repeated as many times as there are
operating clocks.
 SUM (1 byte): Checksum
Rev. 4.00 Jul. 25, 2008 Page 635 of 750
REJ09B0243-0400