HT45R37 datasheet(32/100 Pages) HOLTEK

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HT45R37

Rev. 1.10

January 29, 2010

P W M R e g i s t e r s

b 7

b 0

P W M O n / O f f C o n t r o l

1 : P W M e n a b l e

0 : I / O p i n e n a b l e

N o t i m p l e m e n t e d , r e a d a s " 0 "

P W M A C V a l u e

b i t s 0 ~ 3

P W M D C V a l u e

b i t s 4 ~ 1 1

E N

b 7

b 0

1 1

1 0

P W M 0 L ~ P W M 1 L

L o w B y t e R e g i s t e r s

P W M 0 H ~ P W M 1 H

H i g h B y t e R e g i s t e r s

PWM Register Pairs

f S Y S / 2

P W M

[ P W M ] = 1 6 0 0

[ P W M ] = 1 6 0 1

P W M

[ P W M ] = 1 6 0 2

P W M

[ P W M ] = 1 6 1 5

P W M

P W M c y c l e : 4 0 9 6 / f S Y S

1 0 0 / 2 5 6

1 0 1 / 2 5 6

M o d u l a t i o n c y c l e 0

P W M m o d u l a t i o n p e r i o d : 2 5 6 / f S Y S

M o d u l a t i o n c y c l e 1

M o d u l a t i o n c y c l e 2

M o d u l a t i o n c y c l e 1 5

M o d u l a t i o n c y c l e 0

1 0 0 / 2 5 6

1 0 1 / 2 5 6

1 0 0 / 2 5 6

1 0 1 / 2 5 6

1 0 0 / 2 5 6

1 0 1 / 2 5 6

8+4 PWM Mode

PWM Programming Example

The following sample program shows how the PWM output is setup and controlled.

mov a,64h

; setup PWM0 value to 1600 decimal which is 640H

mov pwm0h,a

; setup PWM0H register value

clr pwm0l

; setup PWM0L register value

clr pdc.0

; setup pin PD0 as an output

set pwm0en

; set the PWM0 enable bit

set pd.0

; Enable the PWM0 output

clr pd.0

; PWM0 output disabled

- PD0 will remain low

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