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HT98R068-1 데이터시트(PDF) 49 Page - Holtek Semiconductor Inc |
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HT98R068-1 데이터시트(HTML) 49 Page - Holtek Semiconductor Inc |
49 / 116 page Rev. 1.10 48 �e���a�� 1�� �01� Rev. 1.10 49 �e���a�� 1�� �01� HT98R068-1 Two Way Radio 8-Bit MCU HT98R068-1 Two Way Radio 8-Bit MCU Timer Control Registers – TMR0C, TMR1C, TMR2C The flexible features of the Holtek microcontroller Timer/Event Counters enable them to operate in three different modes, the options of which are determined by the contents of their respective control register. The Timer Control Register is known as TMRnC. It is the Timer Control Register together with its corresponding timer register that control the full operation of the Timer/Event Counter. Before the timer can be used, it is essential that the Timer Control Register is fully programmed with the right data to ensure its correct operation, a process that is normally carried out during program initialisation. To choose which of the three modes the timer is to operate in, either in the timer mode, the event counting mode or the pulse width capture mode, bits 7 and 6 of the Timer Control Register, which are known as the bit pair TnM1/TnM0, must be set to the required logic levels. The timer-on bit, which is bit 4 of the Timer Control Register and known as TnON, provides the basic on/off control of the respective timer. Setting the bit high allows the counter to run, clearing the bit stops the counter. Bits 0~2 of the Timer Control Register determine the division ratio of the input clock prescaler. The prescaler bit settings have no effect if an external clock source is used. If the timer is in the event count or pulse width capture mode, the active transition edge level type is selected by the logic level of bit 3 of the Timer Control Register which is known as TnEG. The TnS bit selects the internal clock source. TMR0C Register Bit 7 6 5 4 3 2 1 0 Name T0M1 T0M0 T0S T0ON T0EG T0PSC� T0PSC1 T0PSC0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 0 0 1 0 0 0 Bit 7, 6 T0M1, T0M0: Timer0 operation mode selection 00: no mode available 01: event counter mode 10: timer mode 11: pulse width capture mode Bit 5 T0S: timer clock source 0: fSYS 1: LXT oscillator Bit 4 T0ON: Timer/event counter counting enable 0: disable 1: enable Bit 3 T0EG: Event counter active edge selection 0: count on rising edge 1: count on falling edge Pulse Width Capture active edge selection 0: start counting on falling edge, stop on rising edge 1: start counting on rising edge, stop on falling edge Bit 2~0 T0PSC2, T0PSC1, T0PSC0: Timer prescaler rate selection Timer internal clock= 000: fTP 001: fTP/2 010: fTP/4 011: fTP/8 100: fTP/16 101: fTP/32 110: fTP/64 111: fTP/128 |
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유사한 설명 - HT98R068-1_13 |
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