HD64F2168 Datasheet, PDF (721/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

(k) New Bit-Rate Selection
The boot program will set a new bit rate and return the new bit rate.
This selection should be sent after sending the clock mode selection command.
Command H'3F
Size
Bit rate
Input frequency
Number of
Multiplication Multiplication
multiplication ratios ratio 1
ratio 2
SUM
• Command, H'3F, (1 byte): Selection of new bit rate
• Size (1 byte): The number of bytes that represents the bit rate, input frequency, number of
multiplication ratios, and multiplication ratio
• Bit rate (2 bytes): New bit rate
One hundredth of the value (e.g. when the value is 19200 bps, it will be 192, which is
H′00C0.)
• Input frequency (2 bytes): Frequency of the clock input to the boot program
This is valid to the hundredths place and represents the value in MHz multiplied by 100. (E.g.
when the value is 20.00 MHz, it will be 2000, which is H'07D0.)
• Number of multiplication ratios (1 byte): The number of multiplication ratios to which the
device can be set.
• Multiplication ratio 1 (1 byte) : The value of multiplication or division ratios for the main
operating frequency
Multiplication ratio (1 byte): The value of the multiplication ratio (e.g. when the clock
frequency is multiplied by four, the multiplication ratio will be H'04.)
Division ratio: The inverse of the division ratio, as a negative number (e.g. when the clock
frequency is divided by two, the value of division ratio will be H'FE. H'FE = D'-2)
• Multiplication ratio 2 (1 byte): The value of multiplication or division ratios for the peripheral
frequency
Multiplication ratio (1 byte): The value of the multiplication ratio (e.g. when the clock
frequency is multiplied by four, the multiplication ratio will be H'04.)
(Division ratio: The inverse of the division ratio, as 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)
• SUM (1 byte): Checksum
Response H'06
• Response, H'06, (1 byte): Response to selection of a new bit rate
When it is possible to set the bit rate, the response will be ACK.
Error Response H'BF ERROR
• Error response, H'BF, (1 byte): Error response to selection of new bit rate
Rev. 3.00, 03/04, page 681 of 830