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ATMEGA8515-16AU Datasheet(PDF) 98 Page - ATMEL Corporation |
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ATMEGA8515-16AU Datasheet(HTML) 98 Page - ATMEL Corporation |
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98 / 254 page  98 ATmega8515(L) 2512G–AVR–03/05 also set the Compare Match Flag (OCF1A/B) which can be used to generate an output compare interrupt request. The Input Capture Register can capture the Timer/Counter value at a given external (edge triggered) event on either the Input Capture Pin (ICP1) or on the Analog Compar- ator pins (See “Analog Comparator” on page 162.) The Input Capture unit includes a digital filtering unit (Noise Canceler) for reducing the chance of capturing noise spikes. The TOP value, or maximum Timer/Counter value, can in some modes of operation be defined by either the OCR1A Register, the ICR1 Register, or by a set of fixed values. When using OCR1A as TOP value in a PWM mode, the OCR1A Register can not be used for generating a PWM output. However, the TOP value will in this case be double buffered allowing the TOP value to be changed in run time. If a fixed TOP value is required, the ICR1 Register can be used as an alternative, freeing the OCR1A to be used as PWM output. Definitions The following definitions are used extensively throughout the document: Compatibility The 16-bit Timer/Counter has been updated and improved from previous versions of the 16-bit AVR Timer/Counter. This 16-bit Timer/Counter is fully compatible with the earlier version regarding: • All 16-bit Timer/Counter related I/O Register address locations, including Timer Interrupt Registers. • Bit locations inside all 16-bit Timer/Counter Registers, including Timer Interrupt Registers. • Interrupt Vectors. The following control bits have changed name, but have same functionality and register location: • PWM10 is changed to WGM10. • PWM11 is changed to WGM11. • CTC1 is changed to WGM12. The following bits are added to the 16-bit Timer/Counter Control Registers: • FOC1A and FOC1B are added to TCCR1A. • WGM13 is added to TCCR1B. The 16-bit Timer/Counter has improvements that will affect the compatibility in some special cases. Table 49. Definitions BOTTOM The counter reaches the BOTTOM when it becomes 0x0000. MAX The counter reaches its MAXimum when it becomes 0xFFFF (decimal 65535). TOP The counter reaches the TOP when it becomes equal to the highest value in the count sequence. The TOP value can be assigned to be one of the fixed values: 0x00FF, 0x01FF, or 0x03FF, or to the value stored in the OCR1A or ICR1 Register. The assignment is dependent of the mode of operation. |
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