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HT56RB688 Scheda tecnica(PDF) 57 Page - Holtek Semiconductor Inc |
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HT56RB688 Scheda tecnica(HTML) 57 Page - Holtek Semiconductor Inc |
57 / 164 page 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 |
Codice articolo simile - HT56RB688_13 |
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Descrizione simile - HT56RB688_13 |
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