AT90S2323 datasheet(28/64 Pages) ATMEL

Part #	AT90S2323

Description	8-Bit Microcontroller with 2K Bytes of In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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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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