Preliminary
SN8P1702A/SN8P1703A
8-bit micro-controller build-in 12-bit ADC
TC0 CLOCK FREQUENCY OUTPUT (BUZZER)
TC0 timer counter provides a 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 TC0 output signal divides by 2. The TC0 clock
has many combinations and easily to make difference frequency. This function applies as buzzer output to output
multi-frequency.
Figure 8-2. The TC0OUT Pulse Frequency
ꢁExample: Setup TC0OUT output from TC0 to TC0OUT (P5.4). The external high-speed clock is 4MHz. 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, TC0X8 = 0, TC0_Counter=8-bit
B0BCLR
MOV
B0MOV
FTC0X8
A,#01100000B
TC0M,A
; Set TC0X8 to 0
; Set the TC0 rate to Fcpu/4
; Set the auto-reload reference value
MOV
B0MOV
B0MOV
A,#131
TC0C,A
TC0R,A
B0BSET
B0BSET
B0BSET
FTC0OUT
FALOAD0
FTC0ENB
; Enable TC0 output to P5.4 and disable P5.4 I/O function
; Enable TC0 auto-reload function
; Enable TC0 timer
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