SH7125_08 Datasheet, PDF (656/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Flash Memory
(6) 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
Operating freq. (min)
…
SUM
No. of frequency types
Operating freq. (max)
 Response H'33 (1 byte): Response to the inquiry on operating frequency
 Size (1 byte): The total length of the number of frequency types, and maximum and
minimum values of operating frequency fields.
 Number of frequency types (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 values are included as there are frequency types.
 SUM (1 byte): Checksum
Rev. 4.00 Jul. 25, 2008 Page 636 of 750
REJ09B0243-0400