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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega169P датащи(PDF) 152 Page - ATMEL Corporation |
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ATmega169P датащи(HTML) 152 Page - ATMEL Corporation |
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152 / 393 page  152 8018N–AVR–08/09 ATmega169P 17.9 Timer/Counter Prescaler Figure 17-12. Prescaler for Timer/Counter2 The clock source for Timer/Counter2 is named clk T2S. clkT2S is by default connected to the main system I/O clock clk IO. By setting the AS2 bit in ASSR, Timer/Counter2 is asynchronously clocked from the TOSC1 pin. This enables use of Timer/Counter2 as a Real Time Counter (RTC). When AS2 is set, pins TOSC1 and TOSC2 are disconnected from Port C. A crystal can then be connected between the TOSC1 and TOSC2 pins to serve as an independent clock source for Timer/Counter2. The Oscillator is optimized for use with a 32.768 kHz crystal. If applying an external clock on TOSC1, the EXCLK bit in ASSR must be set. For Timer/Counter2, the possible prescaled selections are: clk T2S/8, clkT2S/32, clkT2S/64, clk T2S/128, clkT2S/256, and clkT2S/1024. Additionally, clkT2S as well as 0 (stop) may be selected. Setting the PSR2 bit in GTCCR resets the prescaler. This allows the user to operate with a pre- dictable prescaler. 10-BIT T/C PRESCALER TIMER/COUNTER2 CLOCK SOURCE clk I/O clk T2S TOSC1 AS2 CS20 CS21 CS22 0 PSR2 Clear clk T2 |
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