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HT82B40R Fiches technique(PDF) 19 Page - Holtek Semiconductor Inc

No de pièce HT82B40R
Description  I/O 8-Bit MCU with USB Interface
Download  54 Pages
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Fabricant  HOLTEK [Holtek Semiconductor Inc]
Site Internet  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT82B40R Fiches technique(HTML) 19 Page - Holtek Semiconductor Inc

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HT82B40R/HT82B40A
Rev. 1.70
19
November 5, 2014
the port control register configures the pin as an input. It
should be noted that in the event counting mode, even if
the microcontroller is in the Power Down Mode, the
Timer/Event Counter will continue to record externally
changing logic events on the timer input pin. As a result
when the timer overflows it will generate a timer interrupt
and corresponding wake-up source.
Configuring the Pulse Width Measurement Mode
In this mode, the Timer/Event Counter can be utilised to
measure the width of external pulses applied to the ex-
ternal timer pin. To operate in this mode, the Operating
Mode Select bit pair, T0M1/T0M0 or T1M1/T1M0, in the
Timer Control Register must be set to the correct
valueas shown.
Control Register Operating Mode Select
Bits for the Pulse Width Measurement Mode
Bit7 Bit6
11
In this mode the internal clock, fSYS/4 is used as the in-
ternal clock for the Timer/Event Counters. After the
other bits in the Timer Control Register have been
setup, the enable bit T0ON or T1ON, which is bit 4 of the
Timer Control Register, can be set high to enable the
Timer/Event Counter, however it will not actually start
counting until an active edge is received on the external
timer pin.
If the Active Edge Select bit T0E or T1E, which is bit 3 of
the Timer Control Register, is low, once a high to low
transition has been received on the external timer pin,
TMR0 or TMR1, the Timer/Event Counter will start
counting until the external timer pin returns to its original
high level. At this point the enable bit will be automati-
cally reset to zero and the Timer/Event Counter will stop
counting. If the Active Edge Select bit is high, the
Timer/Event Counter will begin counting once a low to
high transition has been received on the external timer
pin and stop counting when the external timer pin re-
turns to its original low level. As before, the enable bit
will be automatically reset to zero and the Timer/Event
Counter will stop counting. It is important to note that in
the Pulse Width Measurement Mode, the enable bit is
automatically reset to zero when the external control
signal on the external timer pin returns to its original
level, whereas in the other two modes the enable bit can
only be reset to zero under program control.
The residual value in the Timer/Event Counter, which
can now be read by the program, therefore represents
the length of the pulse received on the external timer
pin. As the enable bit has now been reset, any further
transitions on the external timer pin will be ignored. Not
until the enable bit is again set high by the program can
the timer begin further pulse width measurements. In
this way, single shot pulse measurements can be easily
made.
It should be noted that in this mode the Timer/Event
Counter is controlled by logical transitions on the exter-
nal timer pin and not by the logic level. When the
Timer/Event Counter is full and overflows, an interrupt
signal is generated and the Timer/Event Counter will re-
load the value already loaded into the preload register
and continue counting. The interrupt can be disabled by
ensuring that the Timer/Event Counter Interrupt Enable
bit in the Interrupt Control Register, INTC, is reset to
zero.
As the external timer pin is shared with an I/O pin, to en-
sure that the pin is configured to operate as a pulse
width measurement pin, two things have to happen. The
first is to ensure that the Operating Mode Select bits in
the Timer Control Register place the Timer/Event Coun-
ter in the Pulse Width Measurement Mode, the second
is to ensure that the port control register configures the
pin as an input.ot by the logic level.
+ 1
+ 2
+ 3
+ 4
T i m e r
E x t e r n a l T i m e r
P i n I n p u t
T 0 O N o r T 1 O N
( w i t h T 0 E o r T 1 E = 0 )
P r e s c a l e r O u t p u t
I n c r e m e n t
T i m e r C o u n t e r
P r e s c a l e r O u t p u t i s s a m p l e d a t e v e r y f a l l i n g e d g e o f T 1 .
Pulse Width Measure Mode Timing Chart


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