H8S2112R Datasheet, PDF (805/984 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family / H8S/2100 Series

Section 24 Flash Memory
(f) Operating Clock Frequency Inquiry
The boot program will return the number of operating clock frequencies, and the maximum and
minimum values.
Command H'23
• Command, H'23, (one byte): Inquiry regarding operating clock frequencies
Response H'33
Size
Number of operating
clock frequencies
Minimum value of
Maximum value of operating clock
operating clock frequency frequency
…
SUM
• Response, H'33, (one byte): Response to operating clock frequency inquiry
• Size (one byte): The number of bytes that represents the minimum values, maximum values,
and the number of frequencies.
• Number of operating clock frequencies (one byte): The number of supported operating clock
frequency types (e.g. when there are two operating clock frequency types, which are the main
and peripheral clocks, the number of types will be H'02.)
• Minimum value of operating clock frequency (two bytes): The minimum value of the
multiplied or divided clock frequency.
The minimum and maximum values of the operating clock frequency represent the values in
MHz, valid to the hundredths place of MHz, and multiplied by 100. (e.g. when the value is
17.00 MHz, it will be 2000, which is H'07D0.)
• Maximum value (two bytes): Maximum value among the multiplied or divided clock
frequencies.
There are as many pairs of minimum and maximum values as there are operating clock
frequencies.
• SUM (one byte): Checksum
Rev. 1.00 May 09, 2008 Page 779 of 954
REJ09B0462-0100