SN8P1602AX datasheet(64/94 Pages) SONIX

64 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 64

Revision 1.94

PWM PROGRAM DESCRIPTION

Example: Setup PWM1 output from TC1 to PWM1OUT (P5.3). 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. TC1 rate is Fcpu/4. The TC1RATE2~TC1RATE1 = 110. TC1C = TC1R = 30.

MOV

A,#01100000B

B0MOV

TC1M,A

; Set the TC1 rate to Fcpu/4

MOV

A,#0x00

;First Time Initial TC0

B0MOV

TC1C,A

MOV

A,#30

; Set the PWM duty to 30/256

B0MOV

TC1R,A

B0BCLR

FTC1OUT

; Disable TC1OUT function.

B0BSET

FPWM1OUT

; Enable PWM1 output to P5.3 and disable P5.3 I/O function

B0BSET

FTC1ENB

; Enable TC1 timer

Note1: The TC1R is write-only register. Don’t process them using INCMS, DECMS instructions.

Note2: Set TC1C at initial is to make first duty-cycle correct. After TC1 is enabled, don’t modify TC1R

value to avoid duty cycle error of PWM output.

Example: Modify TC1R registers’ value.

MOV

A, #30H

; Input a number using B0MOV instruction.

B0MOV

TC1R, A

INCMS

BUF1

; Get the new TC1R value from the BUF1 buffer defined by

B0MOV

A, BUF1

; programming.

B0MOV

TC1R, A

Note3: 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 TC1OUT function must be set “0” when PWM1 output enable.

Note5: The PWM can work with interrupt request.

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