[avant, acorde] 112C: FREQ SETTING ERR (Target Definition: FRX830)

1. Error Meaning
 112C: FREQ SETTING ERR indicates that the MCU operating frequency value
 notified to the microcontroller during initial communication is outside the valid
 setting range of the MCU.

Microcontrollers require wait-state adjustments for communication based
on their operating frequency. However, since the MCU cannot recognize its own
operating frequency, the programmer must notify it of the correct operating
frequency via a dedicated command at the start of communication.

2. Causes and Countermeasures

Cause: Incorrect parameter settings (Input clock, Multiplication factor, or Frequency division ratio).

Countermeasure (Workaround): Correct the parameter settings according to the
actual operating frequency of the MCU.

• Calculation Formula for MCU Operating Clock

  Operating Clock = MCU Clock Frequency (Input Clock) x Multiplication Factor ÷ Frequency Division Ratio

  Note: Configure the parameters so that the result of multiplication and division based on the input clock falls within the MCU's maximum operating frequency range.

• Setting Locations for Each Parameter

  1. MCU Clock Frequency ([Parameter Table 1] Tab):
      Set the clock frequency input to the MCU (the frequency of the crystal oscillator
      mounted on the target board).
     

  2. Multiplication Factor & Frequency Division Ratio ([Parameter Table 2] Tab):
      If prompted for a password when selecting the tab, enter "AF200".

     • Multiplication Factor: Set at Address #C6 in hexadecimal.

     • Frequency Division Ratio: Set at Address #C8 in hexadecimal
        (Valid for values 1 or higher; 00 means no division).
       

Setting Examples:

• Example 1: Input Clock 8.0 MHz / MCU Operating Frequency 80.0 MHz (x10 Multiplication)

  • MCU Clock Frequency: 8.0 [MHz]

  • Parameter Table 2 #C6 (Multiplication Factor): 0A (Hexadecimal for 10)

  • Parameter Table 2 #C8 (Division Ratio): 00 or 01

• Example 2: Input Clock 16.0 MHz / MCU Operating Frequency 120.0 MHz (x15 Multiplication / ÷2 Division)

  • MCU Clock Frequency: 16.0 [MHz]

  • Parameter Table 2 #C6 (Multiplication Factor): 0F (Hexadecimal for 15)

  • Parameter Table 2 #C8 (Division Ratio): 02 (Hexadecimal for 2)

<Correct combination of input clock, multiplication factor, and division ratio settings corresponding to the microcontroller operating frequency>

Note:

If the clock parameters are incorrect, the error may not appear as 112C: FREQ SETTING ERR, but could instead result in communication errors such as DEVICE ILLEGAL REPLY or DEVICE SCI SUM ERR.