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AT90S8535 Datasheet(PDF) 33 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 33 Page - ATMEL Corporation |
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33 / 127 page  33 AT90S/LS8535 1041H–11/01 The clock source for Timer/Counter2 prescaler is named PCK2. PCK2 is by default con- nected to the main system clock (CK). By setting the AS2 bit in ASSR, Timer/Counter2 prescaler is asynchronously clocked from the PC6(TOSC1) pin. This enables use of Timer/Counter2 as a Real-time Clock (RTC). When AS2 is set, pins PC6(TOSC1) and PC7(TOSC2) are disconnected from Port C. A crystal can then be connected between the PC6(TOSC1) and PC7(TOSC2) pins to serve as an independent clock source for Timer/Counter2. The oscillator is optimized for use with a 32.768 kHz crystal. Applying an external clock source to TOSC1 is not recommended. 8-bit Timer/Counter0 Figure 30 shows the block diagram for Timer/Counter0. The 8-bit Timer/Counter0 can select clock source from CK, prescaled CK or an external pin. In addition, it can be stopped as described in the specification for the Timer/Counter0 Control Register (TCCR0). The overflow status flag is found in the Timer/Counter Interrupt Flag Register (TIFR). Control signals are found in the Timer/Counter0 Control Register (TCCR0). The interrupt enable/disable settings for Timer/Counter0 are found in the Timer/Counter Interrupt Mask Register (TIMSK). When Timer/Counter0 is externally clocked, the external signal is synchronized with the oscillator frequency of the CPU. To assure proper sampling of the external clock, the minimum time between two external clock transitions must be at least one internal CPU clock period. The external clock signal is sampled on the rising edge of the internal CPU clock. The 8-bit Timer/Counter0 features both a high-resolution and a high-accuracy usage with the lower prescaling opportunities. Similarly, the high prescaling opportunities make the Timer/Counter0 useful for lower speed functions or exact timing functions with infre- quent actions. Figure 30. Timer/Counter0 Block Diagram T/C0 CONTROL REGISTER (TCCR0) TIMER/COUNTER0 (TCNT0) 0 7 T/C CLK SOURCE CONTROL LOGIC CK T/C0 OVER- FLOW IRQ TIMER INT. MASK REGISTER (TIMSK) TIMER INT. FLAG REGISTER (TIFR) T0 |
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