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The adjustment interval can be set by a customer program. It is assumed that a frequency accuracy adjustment program is executed before a process requiring high frequency accuracy such as UART communication. The frequency accuracy adjustment program executes the following: (1) Turn ON the internal temperature sensor and execute A/D conversion of sensor output. (2) Calculate an adjustment value based on the A/D conversion result. (3) Set the adjustment value to the low-speed RC oscillation frequency adjustment register (LRCADJ).