SN8P2624
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 85 Version 0.3
8.4.4 PWM PROGRAM EXAMPLE
¾ Example: Setup PWM1 output from TC1 to PWM1OUT (P5.3). The external high-speed oscillator clock is
4MHz. Fcpu = Fosc/4. 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,#30 ; Set the PWM duty to 30/256
B0MOV TC1C,A
B0MOV TC1R,A
B0BCLR FTC1OUT ; Set duty range as 0/256~255/256.
B0BCLR FALOAD1
B0BSET FPWM1OUT ; Enable PWM1 output to P5.3 and disable P5.3 I/O function
B0BSET FTC1ENB ; Enable TC1 timer
Note: The TC1R is write-only register. Don’t process them using INCMS, DECMS instructions.
¾ Example: Modify TC1R registers’ value.
MOV A, #30H ; Input a number using B0MOV instruction.
B0MOV TC1R, A
INCMS BUF0 ; Get the new TC1R value from the BUF0 buffer defined by
NOP ; programming.
B0MOV A, BUF0
B0MOV TC1R, A
Note: The PWM can work with interrupt request.
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