SH7059 Datasheet, PDF (876/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

25. ROM (SH7059)
Error response H'91 ERROR
⎯ Error response: H'91 (one byte): Error response to the clock-mode selection command
⎯ ERROR (one byte): Error code
H'11: Checksum error
H'22: Clock mode mismatch error
(5) Multiplication Ratio Inquiry
The boot program will return the supported multiplication/division ratios.
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
⎯ Size (one byte): Number of bytes that represents the number of types, minimum values, and maximum values of
operating clock frequencies.
⎯ Number of types (one byte): Number of supported operating clock frequency types
(e.g. when there are two operating clock frequency types, which are the main and peripheral clocks, the number of
types will be H'02)
Rev.3.00 Mar. 12, 2008 Page 786 of 948
REJ09B0177-0300