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AT90S2323 Datasheet(PDF) 28 Page - ATMEL Corporation |
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AT90S2323 Datasheet(HTML) 28 Page - ATMEL Corporation |
28 / 64 page 28 AT90S/LS2323/2343 1004D–09/01 Timer/Counter The AT90S2323/2343 provides one general-purpose 8-bit Timer/Counter – Timer/Counter0. The Timer/Counter has prescaling selection from the 10-bit prescaling timer. The Timer/Counter can be used either as a timer with an internal clock time base or as a counter with an external pin connection that triggers the counting. Timer/Counter Prescaler Figure 29 shows the Timer/Counter prescaler. Figure 29. Timer/Counter0 Prescaler The four different prescaled selections are: CK/8, CK/64, CK/256 and CK/1024, where CK is the oscillator clock. CK, external source and stop can also be selected as clock sources. 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 ensure 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. 10-BIT T/C PRESCALER 0 TIMER/COUNTER0 CLOCK SOURCE TCK0 CK T0 CS00 CS01 CS02 |
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