SMBP2501BPB datasheet(84/107 Pages) SONIX

84 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 84

Version 2.1

8.3.5 TC0 CLOCK FREQUENCY OUTPUT (BUZZER)

Buzzer output (TC0OUT) is from TC0 timer/counter frequency output function. By setting the TC0 clock frequency, the

clock signal is output to P5.4 and the P5.4 general purpose I/O function is auto-disable. The TC0OUT frequency is

divided by 2 from TC0 interval time. TC0OUT frequency is 1/2 TC0 frequency. The TC0 clock has many combinations

and easily to make difference frequency. The TC0OUT frequency waveform is as following.

TC0 Overflow Clock

TC0OUT (Buzzer) Output Clock



Example: Setup TC0OUT output from TC0 to TC0OUT (P5.4). The external high-speed clock is 4MHz. Fcpu

= Fosc/4 = 1MIPS. The TC0OUT frequency is 1KHz. Because the TC0OUT signal is divided by 2, set the

TC0 clock to 2KHz. The TC0 clock source is from external oscillator clock. TC0 rate is Fcpu/4. The

TC0RATE2~TC0RATE1 = 110. TC0C = TC0R = 131.

MOV

A,#01100000B

B0MOV

TC0M,A

; Set the TC0 rate to Fcpu/4

MOV

A,#131

; Set the auto-reload reference value

B0MOV

TC0C,A

B0MOV

TC0R,A

B0BSET

FTC0OUT

; Enable TC0 output to P5.4 and disable P5.4 I/O function

B0BSET

FALOAD1

; Enable TC0 auto-reload function

B0BSET

FTC0ENB

; Enable TC0 timer



Note: Buzzer output is enable, and

“PWM0OUT” must be “0”.

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