
Section 19 Flash Memory (0.18-
m F-ZTAT Version)
Rev. 1.00 Mar. 02, 2006 Page 658 of 798
REJ09B0255-0100
SUM (1 byte): Checksum
(k)
New Bit Rate Selection
The boot program will set a new bit rate in response to the new bit rate selection command, and
return the new bit rate in response to the confirmation.
This new bit rate selection command should be sent after sending the clock mode selection
command.
Command
H'3F
Size
Bit rate
Input frequency
Number of division
ratios
Division ratio 1 Division ratio 2
SUM
Command, H'3F (1 byte): Selection of new bit rate
Size (1 byte): The amount of data that represents the bit rate, input frequency, number of
division ratios, and division ratios
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 frequency value (MHz) multiplied by
100. (e.g. when the value is 20.00 MHz, it will be 2000, which is H'07D0)
Number of division ratios (1 byte): The number of supported division ratios.
Normally the number is two: one for the main operating frequency and one for peripheral
module operating frequency.
Division ratio 1 (1 byte): The division ratio for the main operating frequency
Division ratio: The inverse of the division ratio, i.e. a negative number (e.g. when the clock
is divided by two, the value will be H'FE[
2])
Division ratio 2 (1 byte): The division ratio for the peripheral module operating frequency
Division ratio: The inverse of the division ratio, i.e. a negative number (e.g. when the clock
is divided by two, the value will be H'FE[
2])
SUM (1 byte): Checksum
Response
H'06
Response, H'06 (1 byte): Response to selection of a new bit rate.
The boot program will return ACK when the new bit rate can be set.
Error Response
H'BF
ERROR
Error response, H'BF (1 byte): Error response to selection of a new bit rate