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HT98R068-1 Scheda tecnica(PDF) 52 Page - Holtek Semiconductor Inc

Il numero della parte HT98R068-1
Spiegazioni elettronici  Two Way Radio 8-Bit MCU
Download  116 Pages
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Produttore elettronici  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT98R068-1 Scheda tecnica(HTML) 52 Page - Holtek Semiconductor Inc

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HT98R068-1
Two Way Radio 8-Bit MCU
HT98R068-1
Two Way Radio 8-Bit MCU
to enable the Timer/Event Counter to run. If the Active Edge Select bit, TnEG, which is bit 3 of the
Timer Control Register, is low, the Timer/Event Counter will increment each time the external timer
pin receives a low to high transition. If the TnEG is high, the counter will increment each time the
external timer pin receives a high to low transition. When it is full and overflows, an interrupt signal
is generated and the Timer/Event Counter will reload 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 corresponding Interrupt Control Register, is reset to zero.
As the external timer pin is shared with an I/O pin, to ensure that the pin is configured to operate as
an event counter input 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 Counter in the Event Counting
Mode, the second is to ensure that the port control register configures the pin as an input. It should
be noted that in the event counting mode, even if the is in the Idle/Sleep Mode, the Timer/Event
Counter will continue to record externally changing logic events on the timer input TMRn pin. As a
result when the timer overflows it will generate a timer interrupt and corresponding wake-up source.
Ti me r+ 2
Ex te rn al E ve nt
In cr em en t
Ti me r C oun te r
Ti me r+ 3
Ti me r+ 1
Event Counter Mode Timer Chart (TnEG=1)
Pulse Width Capture Mode
In this mode, the Timer/Event Counter can be utilised to measure the width of external pulses
applied to the external timer pin. To operate in this mode, the Operating Mode Select bit pair, TnM1/
TnM0, in the Timer Control Register must be set to the correct value as shown.
Control Register Operating Mode Select Bits for the Pulse Width Capture Mode
Bit7
Bit6
1
1
In this mode the internal clock, fSYS , fSYS/4 or the LXT, is used as the internal clock for the 8-bit
Timer/Event Counter and the 16-bit Timer/Event Counter. However, the clock source, fSYS and
fSYS/4, for the 8-bit timer and the 16-bit timer are further divided by a prescaler, the value of which
is determined by the Prescaler Rate Select bits TnPSC2~TnPSC0, which are bits 2~0 in the Timer
Control Register. After the other bits in the Timer Control Register have been setup, the enable
bit TnON, 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 TnEG, 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, 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 automatically 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 returns
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 capture 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


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