Datasheet

Section 22 Flash Memory
Rev. 3.00 Sep. 28, 2009 Page 736 of 910
REJ09B0350-0300
(e) Division Ratio Inquiry
The boot program will return the supported division ratios in response to the inquiry.
Command H'22
• Command, H'22, (one byte): Inquiry regarding division ratio
Response H'32 Size Number
of types
Number of division
ratios
Division
ratio
…
…
SUM
• Response, H'32, (one byte): Response to the division ratio inquiry
• Size (one byte): The total amount of data that represents the number of types, the number of
division ratios, and the division ratios
• Number of types (one byte): The number of supported divided clock types
(e.g. when there are two divided clock types, which are the main and peripheral clocks, the
number of types will be H'02.)
• Number of division ratios (one byte): The number of division ratios for each type
(e.g. the number of division ratios to which the main clock can be set and the peripheral clock
can be set.)
• Division ratio (one byte)
Division ratio: The inverse of the division ratio, i.e. a negative number (e.g. when the clock is
divided by two, the value of division ratio will be H'FE. H'FE = D'-2)
The number of division ratios returned is the same as the number of division ratios and as
many groups of data are returned as there are types.
• SUM (one byte): Checksum