r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 1105

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

(j)
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, (one byte): Selection of new bit rate
• Size (one byte): The number of bytes that represents the bit rate, input frequency, number of
• Bit rate (two bytes): New bit rate
• Input frequency (two bytes): Frequency of the clock input to the boot program
• Number of multiplication ratios (one byte): The number of multiplication ratios to which the
• Multiplication ratio 1 (one byte): The value of multiplication or division ratios for the main
• Multiplication ratio 2 (one byte): The value of multiplication or division ratios for the
Command
multiplication ratios, and multiplication ratio
One hundredth of the value (e.g. when the value is 19,200 bps, the bit rate is H'00C0, which is
192.)
This is valid to the hundredths place and represents the value in MHz multiplied by 100 (e.g.
when the value is 64 MHz, the input frequency is H'1900 (= 6400)).
device can be set.
operating frequency
Multiplication ratio (one 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 = [-2])
peripheral frequency
Multiplication ratio (one 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 = [-2])
New Bit-Rate Selection
H'3F
Number of
multiplication ratios
SUM
Size
Multiplication
ratio 1
Bit rate
Multiplication
ratio 2
Rev. 1.00 Sep. 19, 2008 Page 1077 of 1270
Input frequency
Section 21 Flash Memory
REJ09B0466-0100