AT90S8535 datasheet(32/127 Pages) ATMEL

Part #	AT90S8535

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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AT90S/LS8535

1041H–11/01

Timer/Counters

The AT90S8535 provides three general-purpose Timer/Counters – two 8-bit T/Cs and

one 16-bit T/C. Timer/Counter2 can optionally be asynchronously clocked from an exter-

nal oscillator. This oscillator is optimized for use with a 32.768 kHz watch crystal,

enabling use of Timer/Counter2 as a Real-time Clock (RTC). Timer/Counters 0 and 1

have individual prescaling selection from the same 10-bit prescaling timer.

Timer/Counter2 has its own prescaler. These Timer/Counters can either be used as a

timer with an internal clock time base or as a counter with an external pin connection

that triggers the counting.

Timer/Counter

Prescalers

Figure 28. Prescaler for Timer/Counter0 and 1

For Timer/Counters 0 and 1, the four different prescaled selections are: CK/8, CK/64,

CK/256 and CK/1024, where CK is the oscillator clock. For the two Timer/Counters 0

and 1, CK, external source and stop can also be selected as clock sources.

Figure 29. Timer/Counter2 Prescaler

TCK1

TCK0

10-BIT T/C PRESCALER

TIMER/COUNTER2 CLOCK SOURCE

TCK2

CK

PCK2

TOSC1

AS2

CS20

CS21

CS22

0

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