SH7211 Datasheet, PDF (981/1228 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family

Section 21 Flash Memory
(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
No. of multipliers Multiplier
…
SUM
Number of
operating clocks
…
• 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
Rev. 2.00 May. 08, 2008 Page 957 of 1200
REJ09B0344-0200