SH7080_09 Datasheet, PDF (1351/1622 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family

Section 23 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 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. 4.00 Dec. 15, 2009 Page 1291 of 1558
REJ09B0181-0400