SN8F2250B Series
USB 2.0 Full-Speed 8-Bit Micro-Controller
8.5.4 PWM PROGRAM EXAMPLE
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Example: Setup PWM0 output from TC0 to PWM0OUT (P5.4). The clock source is internal 6MHz. Fcpu =
Fosc/1. The duty of PWM is 30/256. The PWM frequency is about 6KHz. The PWM clock source is from
external oscillator clock. TC0 rate is Fcpu/4. The TC0RATE2~TC0RATE1 = 110. TC0C = TC0R = 30.
MOV
B0MOV
A,#01100000B
TC0M,A
; Set the TC0 rate to Fcpu/4
; Set the PWM duty to 30/256
MOV
A,#30
B0MOV
B0MOV
TC0C,A
TC0R,A
B0BCLR
B0BCLR
B0BSET
B0BSET
FTC0OUT
FALOAD0
FPWM0OUT
FTC0ENB
; Set duty range as 0/256~255/256.
; Enable PWM0 output to P5.4 and disable P5.4 I/O function
; Enable TC0 timer
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Note: The TC0R is write-only register. Don’t process them using INCMS, DECMS instructions.
Example: Modify TC0R registers’ value.
MOV
B0MOV
A, #30H
TC0R, A
; Input a number using B0MOV instruction.
INCMS
NOP
BUF0
; Get the new TC0R value from the BUF0 buffer defined by
; programming.
B0MOV
B0MOV
A, BUF0
TC0R, A
Note: The PWM can work with interrupt request.
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