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AT90USB646 Datasheet(PDF) 150 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 150 Page - ATMEL Corporation |
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150 / 434 page  150 7593A–AVR–02/06 AT90USB64/128 15. 8-bit Timer/Counter2 with PWM and Asynchronous Operation Timer/Counter2 is a general purpose, single channel, 8-bit Timer/Counter module. The main features are: • Single Channel Counter • Clear Timer on Compare Match (Auto Reload) • Glitch-free, Phase Correct Pulse Width Modulator (PWM) • Frequency Generator • 10-bit Clock Prescaler • Overflow and Compare Match Interrupt Sources (TOV2, OCF2A and OCF2B) • Allows Clocking from External 32 kHz Watch Crystal Independent of the I/O Clock 15.1 Overview A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 15-1.. For the actual placement of I/O pins, see “Pin Configurations” on page 3. CPU accessible I/O Registers, includ- ing I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit locations are listed in the “8-bit Timer/Counter Register Description” on page 161. The Power Reduction Timer/Counter2 bit, PRTIM2, in “Power Reduction Register 0 - PRR0” on page 55 must be written to zero to enable Timer/Counter2 module. Figure 15-1. 8-bit Timer/Counter Block Diagram Timer/Counter OCRnA OCRnB = = TCNTn Waveform Generation Waveform Generation OCnA OCnB = Fixed TOP Value Control Logic = 0 TOP BOTTOM Count Clear Direction TOVn (Int.Req.) OCnA (Int.Req.) OCnB (Int.Req.) TCCRnA TCCRnB clk Tn ASSRn Synchronization Unit Prescaler T/C Oscillator clk I/O clk ASY asynchronous mode select (ASn) Synchronized Status flags TOSC1 TOSC2 Status flags clk I/O |
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