SN8P2604
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 87
Version 1.1
8.4.3 PWM PROGRAM EXAMPLE
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.
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.