HT46F49E datasheet(37/88 Pages) HOLTEK

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HT46F46E/HT46F47E/HT46F48E/HT46F49E

Rev. 1.40

July 28, 2009

PWM Output Control

On all devices, the PWM outputs are pin-shared with

pins PD0 or PD1. To operate as PWM outputs and not

as I/O pins, the correct PWM configuration options must

be selected. A

²0² must also be written to the corre-

sponding bits in the I/O port control register PDC to en-

sure that the required PWM output pin is setup as an

output. After these two initial steps have been carried

out, and of course after the required PWM value has

been written into the PWM register, writing a

²1² to the

corresponding bit in the PD output data register will en-

able the PWM data to appear on the pin. Writing a

²0² to

the corresponding bit in the PD output data register will

disable the PWM output function and force the output

low. In this way, the Port D data output register can be

used as an on/off control for the PWM function. Note

that if the configuration options have selected the PWM

function, but a

²1² has been written to its corresponding

bit in the PDC control register to configure the pin as an

input, then the pin can still function as a normal input

line, with pull-high resistor options.

PWM Programming Example

The following sample program shows how the PWM

outputs are setup and controlled. Before use the corre-

sponding PWM output configuration options must first

be selected.

clr PDC.0

; set pin PD0 as output

clr PDC.1

; set pin PD1 as output

set pd.0

; PD.0=1; enable pin

²PD0/PWM0² to be the PWM channel 0

mov a,64h

; PWM0=100D=64H

mov pwm0,a

set pd.1

; PD.1=1; enable pin

²PD1/PWM1² to be the PWM channel 1

mov a,65h

; PWM1=101D=65H

mov pwm1,a

clr pd.0

; disable PWM0 output

- PD.0 will remain low

clr pd.1

; disable PWM1 output

- PD.1 will remain low

P W M , P W M 0 , P W M 1 R e g i s t e r s

( 7 + 1 ) M o d e

b 7

b 0

A C v a l u e

D C v a l u e

7+1 Mode Pulse Width Modulation Register

HT46F49E Datasheet(PDF) 37 Page - Holtek Semiconductor Inc

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