H8S2472 Datasheet, PDF (1042/1250 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family / H8S/2400 Series

Section 25 Flash Memory
(e) Multiplication Ratio Inquiry
The boot program will return the supported multiplication and division ratios.
Command H'22
• Command, H'22, (1 byte): Inquiry regarding multiplication ratio
Response H'32
Size
Number
of types
Number of
Multiplica- ···
multiplication ratios tion ratio
···
SUM
• Response, H'32, (1 byte): Response to the multiplication ratio inquiry
• Size (1 byte): The amount of data that represents the number of clock sources and
multiplication ratios and the multiplication ratios
• Number of types (1 byte): The number of supported multiplied clock types
(e.g. when there are two multiplied clock types, which are the main and peripheral clocks, the
number of types will be H'02.)
• Number of multiplication ratios (1 byte): The number of multiplication ratios for each type
(e.g. the number of multiplication ratios to which the main clock can be set and the peripheral
clock can be set.)
• Multiplication ratio (1 byte)
Multiplication ratio: The value of the multiplication ratio (e.g. when the clock-frequency
multiplier is four, the value of multiplication ratio will be H'04.)
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 multiplication ratios returned is the same as the number of multiplication ratios
and as many groups of data are returned as there are types.
• SUM (1 byte): Checksum
Rev. 2.00 Aug. 20, 2008 Page 994 of 1198
REJ09B0403-0200