SH7055S Datasheet, PDF (851/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Command H'22
 Command: H'22 (one byte): Inquiry regarding multiplication ratio
Response H'32
Size
Number of
clock types
Number of
Multiplica- ???
multiplication ratios tion ratio
...
SUM
 Response: H'32 (one byte): Response to the multiplication ratio inquiry
 Size (one byte): Amount of data that represents the number of clock types, the number of
multiplication ratios, and the multiplication ratios
 Number of clock types (one byte): Number of supported multiplied clock types
(e.g. when there are two multiplied clock types, which are the main operating frequency
and the peripheral module operating frequency, the number of types will be H'02)
 Number of multiplication ratios (one byte): Number of multiplication ratios for each
operating frequency
(e.g. the number of multiplication ratios to which the main operating frequency can be set
and the peripheral module operating frequency can be set)
 Multiplication ratio (one byte)
Multiplication ratio : 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: Value of the division ratio, inverted to be a negative number (e.g. when the
clock is divided by two, the value of division ratio will be H'FE. H'FE = −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 (one byte): Checksum
(6) 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
Rev.2.0, 07/03, page 813 of 960