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HT56RB688 データシート(PDF) 54 Page - Holtek Semiconductor Inc

部品番号 HT56RB688
部品情報  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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Configuring the Event Counter Mode
In this mode, a number of externally changing logic events, occurring on the external timer pin, can be
recorded by the Timer/Event Counter. 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 Event Counter Mode
Bit7
Bit6
01
In this mode, the external timer pin, is used as the Timer/Event Counter clock source, however it is not
divided by the internal prescaler. 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 to run. If the Active Edge Select bit, TnE, 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 Active Edge Select bit 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 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 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 Measurement Mode
Bit7
Bit6
11
In this mode the internal clock, fSYS, is used as the internal clock for the 8-bit Timer/Event Counter and
fSUB or fSYS/4 is used as the internal clock for the 16-bit Timer/Event Counter. However, the clock
source, fSYS, for the 8-bit timer is 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 TnE, 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
Rev. 1.10
54
April 15, 2013
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
T i m e r + 2
E x t e r n a l E v e n t
I n c r e m e n t
T i m e r C o u n t e r
T i m e r + 3
T i m e r + 1
Event Counter Mode Timing Chart


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