SH7211 Datasheet, PDF (982/1228 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family

Section 21 Flash Memory
(f) 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
Number of operating clocks
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 operating clocks, and maximum and minimum
values of operating frequency fields.
• Number of operating clocks (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/maximum values are included as there are operating clocks.
• SUM (1 byte): Checksum
Rev. 2.00 May. 08, 2008 Page 958 of 1200
REJ09B0344-0200