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ATMEGA8-16PU Datasheet(PDF) 83 Page - ATMEL Corporation |
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ATMEGA8-16PU Datasheet(HTML) 83 Page - ATMEL Corporation |
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83 / 308 page  83 2486T–AVR–05/08 ATmega8(L) are generated on the Output Compare Outputs OC1x. For more details about advanced count- ing sequences and waveform generation, see “Modes of Operation” on page 88. The Timer/Counter Overflow (TOV1) fLag is set according to the mode of operation selected by the WGM13:0 bits. TOV1 can be used for generating a CPU interrupt. Input Capture Unit The Timer/Counter incorporates an Input Capture unit that can capture external events and give them a time-stamp indicating time of occurrence. The external signal indicating an event, or mul- tiple events, can be applied via the ICP1 pin or alternatively, via the Analog Comparator unit. The time-stamps can then be used to calculate frequency, duty-cycle, and other features of the signal applied. Alternatively the time-stamps can be used for creating a log of the events. The Input Capture unit is illustrated by the block diagram shown in Figure 34. The elements of the block diagram that are not directly a part of the Input Capture unit are gray shaded. The small “n” in register and bit names indicates the Timer/Counter number. Figure 34. Input Capture Unit Block Diagram When a change of the logic level (an event) occurs on the Input Capture Pin (ICP1), alternatively on the Analog Comparator Output (ACO), and this change confirms to the setting of the edge detector, a capture will be triggered. When a capture is triggered, the 16-bit value of the counter (TCNT1) is written to the Input Capture Register (ICR1). The Input Capture Flag (ICF1) is set at the same system clock as the TCNT1 value is copied into ICR1 Register. If enabled (TICIE1 = 1), the Input Capture Flag generates an Input Capture interrupt. The ICF1 Flag is automatically cleared when the interrupt is executed. Alternatively the ICF1 Flag can be cleared by software by writing a logical one to its I/O bit location. Reading the 16-bit value in the Input Capture Register (ICR1) is done by first reading the Low byte (ICR1L) and then the High byte (ICR1H). When the Low byte is read the High byte is copied into the High byte temporary register (TEMP). When the CPU reads the ICR1H I/O location it will access the TEMP Register. The ICR1 Register can only be written when using a Waveform Generation mode that utilizes the ICR1 Register for defining the counter’s TOP value. In these cases the Waveform Genera- ICFn (Int. Req.) Analog Comparator WRITE ICRn (16-bit Register) ICRnH (8-bit) Noise Canceler ICPn Edge Detector TEMP (8-bit) DATA BUS (8-bit) ICRnL (8-bit) TCNTn (16-bit Counter) TCNTnH (8-bit) TCNTnL (8-bit) ACIC* ICNC ICES ACO* |
Similar Part No. - ATMEGA8-16PU |
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Similar Description - ATMEGA8-16PU |
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