Operating Frequency Select - Renesas RX100 Series User Manual

RX13T Group
31.10.6.2

Operating Frequency Select

This command is used to specify the operating frequency of the MCU and a bit rate for communication with the flash
memory programmer. The bit rate selected in this command should be set to a value with error of less than 4% compared
to the bit rate obtained by dividing 32 or 8 MHz that corresponds to the operating voltage.
If the specified settings can be supported, the MCU sends a response (06h). If the bit rate error is 4% or more or the SUM
of the received command does not match, the MCU sends an error response.
After the host receives a response, wait for at least a 1-bit period at the old bit rate, and send communication
confirmation data at the new bit rate.
If the MCU successfully receives communication confirmation data, the MCU sends a response (06h). If the MCU fails
to receive the communication confirmation data, the MCU sends an error response.
Command 3Fh
Number of
clocks
SUM
Size (1 byte): Total bytes of data of Bit rate, Dummy data, Number of clocks, and Multiplier (the value is always 07h)
Bit rate (2 bytes): New bit rate
The value is calculated by dividing the bit rate by 100 (Example: Set 00C0h for 19200 bps)
Dummy data (2 bytes): The value should always be set to 0000h
Number of clocks (1 byte): Types of clocks for multiplier setting (the value is always 02h)
Multiplier 1 (1 byte): Multiplier of the system clock (ICLK) (the value is always 01h)
Multiplier 2 (1 byte): Multiplier of the peripheral module clock (PCLK) (the value is always 01h)
SUM (1 byte): Value that is calculated so the sum of command data including dummy data is 00h
Response 06h
Error response BFh
Error (1 byte): Error code
11h: SUM error
24h: Bit rate selection error
Communication
06h
confirmation
Response 06h
Error response FFh
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
Size Bit rate
Multiplier 1 Multiplier 2
Error
31. Flash Memory (FLASH)
Dummy data
Page 962 of 1041