Fujitsu F2MC-8L Series Hardware Manual page 248

Tip: Calculation example for output frequency
For a 4.2 MHz main clock source oscillation (F
the timebase timer divided output cycle of F
frequency of the BZ pin is calculated as follows:
Output frequency
) and if the buzzer register (BZCR) selects
CH
10
/2 (BZ2, BZ1, BZ0 = "011
CH
10
= F /2
CH
= 4.2 MHz/1024
= 4.102 kHz
9.1 Overview of Buzzer Output
"), the output
B
221