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HT46R01B-1 Datasheet(PDF) 42 Page - Holtek Semiconductor Inc

Part No. HT46R01B-1
Description  Small Package 8-Bit OTP MCU
Download  71 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R01B-1 Datasheet(HTML) 42 Page - Holtek Semiconductor Inc

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HT46R01B-1/HT46R01N-1
HT48R01B-1/HT48R01N-1
Rev.1.00
42
June 9, 2011
PWM Output Control
The PWM outputs are pin-shared with the I/O pins PA4.
To operate as a PWM output and not as an I/O pin, the
correct bits must be set in the CTRL0 register. A zero
value must also be written to the corresponding bit in the
I/O port control register PAC.4 to ensure that the corre-
sponding 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 PWMn register, writing a high value to the corre-
sponding bit in the output data register PA.4 will enable
the PWM data to appear on the pin. Writing a zero value
will disable the PWM output function and force the out-
put low. In this way, the Port data output registers can be
used as an on/off control for the PWM function. Note
that if the CTRL0 register have selected the PWM func-
tion, but a high value has been written to its correspond-
ing bit in the PAC 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 output is setup and controlled.
mov a,64h
; setup PWM value of decimal 100
mov pwm0,a
set ctrl0.5
; select the 7+1 PWM mode
set ctrl0.3
; select pin PA4 to have a PWM function
clr pac.4
; setup pin PA4 as an output
set pa.4
; enable the PWM output
::
clr pa.4
; disable the PWM output_ pin
; PA4 forced low


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