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ATMEGA32-16AU Datasheet(PDF) 97 Page - ATMEL Corporation |
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ATMEGA32-16AU Datasheet(HTML) 97 Page - ATMEL Corporation |
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97 / 346 page  97 2503N–AVR–06/08 ATmega32(L) Figure 44. Compare Match Output Unit, Schematic The general I/O port function is overridden by the Output Compare (OC1x) from the Waveform Generator if either of the COM1x1:0 bits are set. However, the OC1x pin direction (input or out- put) is still controlled by the Data Direction Register (DDR) for the port pin. The Data Direction Register bit for the OC1x pin (DDR_OC1x) must be set as output before the OC1x value is visi- ble on the pin. The port override function is generally independent of the Waveform Generation mode, but there are some exceptions. Refer to Table 44, Table 45 and Table 46 for details. The design of the output compare pin logic allows initialization of the OC1x state before the out- put is enabled. Note that some COM1x1:0 bit settings are reserved for certain modes of operation. See “16-bit Timer/Counter Register Description” on page 107. The COM1x1:0 bits have no effect on the Input Capture unit. Compare Output Mode and Waveform Generation The Waveform Generator uses the COM1x1:0 bits differently in normal, CTC, and PWM modes. For all modes, setting the COM1x1:0 = 0 tells the Waveform Generator that no action on the OC1x Register is to be performed on the next compare match. For compare output actions in the non-PWM modes refer to Table 44 on page 107. For fast PWM mode refer to Table 45 on page 108, and for phase correct and phase and frequency correct PWM refer to Table 46 on page 108. A change of the COM1x1:0 bits state will have effect at the first compare match after the bits are written. For non-PWM modes, the action can be forced to have immediate effect by using the FOC1x strobe bits. Modes of Operation The mode of operation, i.e., the behavior of the Timer/Counter and the output compare pins, is defined by the combination of the Waveform Generation mode (WGM13:0) and Compare Output mode (COM1x1:0) bits. The Compare Output mode bits do not affect the counting sequence, while the Waveform Generation mode bits do. The COM1x1:0 bits control whether the PWM out- put generated should be inverted or not (inverted or non-inverted PWM). For non-PWM modes the COM1x1:0 bits control whether the output should be set, cleared or toggle at a compare match (See “Compare Match Output Unit” on page 96.) For detailed timing information refer to “Timer/Counter Timing Diagrams” on page 105. PORT DDR DQ DQ OCnx Pin OCnx DQ Waveform Generator COMnx1 COMnx0 0 1 FOCnx clk I/O |
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