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HT56RB688 Scheda tecnica(PDF) 57 Page - Holtek Semiconductor Inc

Il numero della parte HT56RB688
Spiegazioni elettronici  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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Produttore elettronici  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RB688 Scheda tecnica(HTML) 57 Page - Holtek Semiconductor Inc

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RC Filter Control Register - RCFLT
Bit
76543210
Name
¾¾
INT1FLT
INT0FLT
TM3FLT
TM2FLT
TM1FLT
TM0FLT
R/W
¾¾
R/W
R/W
R/W
R/W
R/W
R/W
POR
¾¾
001000
Bit 7~6
Unimplemented, read as
²0²
Bit 5
INT1FLT: External Interrupt 1 input RC Filter enable control
0: disable
1: enable
Bit 4
INT0FLT: External Interrupt 0 input RC Filter enable control
0: disable
1: enable
Bit 3
TM3FLT: Timer/Event Counter 3 input RC Filter enable control
0: disable
1: enable
Bit 2
TM2FLT: Timer/Event Counter 2 input RC Filter enable control
0: disable
1: enable
Bit 1
TM1FLT: Timer/Event Counter 1 input RC Filter enable control
0: disable
1: enable
Bit 0
TM0FLT: Timer/Event Counter 0 input RC Filter enable control
0: disable
1: enable
Programming Considerations
When configured to run in the timer mode, the internal system clock is used as the timer clock source and
is therefore synchronised with the overall operation of the microcontroller. In this mode when the
appropriate timer register is full, the microcontroller will generate an internal interrupt signal directing
the program flow to the respective internal interrupt vector. For the pulse width measurement mode, the
internal system clock is also used as the timer clock source but the timer will only run when the correct
logic condition appears on the external timer input pin. As this is an external event and not synchronized
with the internal timer clock, the microcontroller will only see this external event when the next timer
clock pulse arrives. As a result, there may be small differences in measured values requiring
programmers to take this into account during programming. The same applies if the timer is configured
to be in the event counting mode, which again is an external event and not synchronised with the internal
system or timer clock.
When the Timer/Event Counter is read, or if data is written to the preload register, the clock is inhibited to
avoid errors, however as this may result in a counting error, this should be taken into account by the
programmer. Care must be taken to ensure that the timers are properly initialised before using them for
the first time. The associated timer interrupt enable bits in the interrupt control register must be properly
set otherwise the internal interrupt associated with the timer will remain inactive. The edge select, timer
mode and clock source control bits in timer control register must also be correctly set to ensure the timer
is properly configured for the required application. It is also important to ensure that an initial value is
first loaded into the timer registers before the timer is switched on; this is because after power-on the
initial values of the timer registers are unknown. After the timer has been initialised the timer can be
turned on and off by controlling the enable bit in the timer control register. Note that setting the timer
enable bit high to turn the timer on, should only be executed after the timer mode bits have been properly
setup. Setting the timer enable bit high together with a mode bit modification, may lead to improper
timer operation if executed as a single timer control register byte write instruction.
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
Rev. 1.10
57
April 15, 2013


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