SN8A1702AX datasheet(89/145 Pages) SONIX

89 / 145 page

SN8P1700

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 89

Revision 1.94

PWM PROGRAM DESCRIPTION

Example: Setup PWM0 output from TC0 to PWM0OUT (P5.4). The external high-speed oscillator clock is

4MHz. The duty of PWM is 30/256. The PWM frequency is about 1KHz. The PWM clock source is

from external oscillator clock. TC0 rate is Fcpu/4. The TC0RATE2~TC0RATE1 = 110. TC0C = TC0R

= 30.

MOV

A,#01100000B

B0MOV

TC0M,A

; Set the TC0 rate to Fcpu/4

B0MOV

TC0M,A

; Set the TC0 rate to Fcpu/4

MOV

A,#0x00

;First Time Initial TC0

MOV

A,#30

; Set the PWM duty to 30/256

B0MOV

TC0R,A

B0BCLR

FTC0OUT

; Disable TC0OUT function.

B0BSET

FPWM0OUT

; Enable PWM0 output to P5.4 and disable P5.4 I/O function

B0BSET

FTC0ENB

; Enable TC0 timer

Note1: The TC0R and TC1R are write-only registers. Don’t process them using INCMS, DECMS

instructions.

Note2: Set TC0C at initial is to make first duty-cycle correct. After TC0 is enabled, don’t modify TC0R

value to avoid duty cycle error of PWM output.

Example: Modify TC0R/TC1R registers’ value.

MOV

A, #30H

; Input a number using B0MOV instruction.

B0MOV

TC0R, A

INCMS

BUF0

; Get the new TC0R value from the BUF0 buffer defined by

B0MOV

A, BUF0

; programming.

B0MOV

TC0R, A

Note3: That is better to set the TC0C and TC0R value together when PWM0 duty modified. It protects the

PWM0 signal no glitch as PWM0 duty changing. That is better to set the TC1C and TC1R value together

when PWM1 duty modified. It protects the PWM1 signal no glitch as PWM1 duty changing.

Note4: The TC0OUT function must be set “0” when PWM0 output enable. The TC1OUT function must be

set “0” when PWM1 output enable.

Note5: The PWM can work with interrupt request.

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