Datasheet

Section 22 Flash Memory
Page 1180 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
(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
multiplication ratios
Multiplica-
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 types 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 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