Renesas H8S Series Hardware Manual page 854

Section 21 Flash Memory (0.18-µm F-ZTAT Version)
(f) Operating Clock Frequency Inquiry
The boot program will return the number of operating clock frequencies, and the maximum and
minimum values in response to the operating clock frequency inquiry command.
Command H'23
• Command, H'23 (1 byte): Inquiry regarding operating clock frequencies
Response H'33
Minimum value of operating
clock frequency
···
SUM
• Response, H'33 (1 byte): Response to operating clock frequency inquiry
• Size (1 byte): The amount of data that represents the number of operating clock frequencies,
and the minimum and maximum values of the operating clock frequencies
• Number of operating clock frequencies (1 byte): The number of supported operating clock
frequency types
(e.g. H'02 when there are two types: main operating frequency and peripheral module
operating frequency)
• Minimum value of operating clock frequency (2 bytes): Minimum value among the divided
clock frequencies.
The minimum and maximum values of operating clock frequency represent the frequency
values (MHz), valid to the hundredths place, and multiplied by 100.
(e.g. when the value is 20.00 MHz, it will be 2000, which is H'07D0)
• Maximum value of operating clock frequency (2 bytes): Maximum value among the divided
clock frequencies.
There are as many pairs of minimum and maximum values as there are operating clock
frequencies.
• SUM (1 byte): Checksum
Rev. 3.00 Jul. 14, 2005 Page 806 of 986
REJ09B0098-0300
Size Number of operating clock
frequencies
Maximum value of operating clock
frequency