SN8F2250B Series
USB 2.0 Full-Speed 8-Bit Micro-Controller
8.6.5 TC1 CLOCK FREQUENCY OUTPUT (BUZZER)
Buzzer output (TC1OUT) is from TC1 timer/counter frequency output function. By setting the TC1 clock frequency, the
clock signal is output to P5.4 and the P5.4 general purpose I/O function is auto-disable. The TC1OUT frequency is
divided by 2 from TC1 interval time. TC1OUT frequency is 1/2 TC1 frequency. The TC1 clock has many combinations
and easily to make difference frequency. The TC1OUT frequency waveform is as following.
1
2
3
4
TC1 Overflow Clock
1
2
3
4
TC1OUT (Buzzer) Output Clock
¾
Example: Setup TC1OUT output from TC1 to TC1OUT (P5.4). The external high-speed clock is 4MHz. The
TC1OUT frequency is 0.5KHz. Because the TC1OUT signal is divided by 2, set the TC1 clock to 1KHz. The
TC1 clock source is from external oscillator clock. T0C rate is Fcpu/4. The TC1RATE2~TC1RATE1 = 110.
TC1C = TC1R = 131.
MOV
B0MOV
A,#01100000B
TC1M,A
; Set the TC1 rate to Fcpu/4
MOV
B0MOV
B0MOV
A,#131
TC1C,A
TC1R,A
; Set the auto-reload reference value
B0BSET
B0BSET
B0BSET
FTC1OUT
FALOAD1
FTC1ENB
; Enable TC1 output to P5.4 and disable P5.4 I/O function
; Enable TC1 auto-reload function
; Enable TC1 timer
Note: Buzzer output is enable, and “PWM0OUT” must be “0”.
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