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ATTINY2313-20MU Datasheet(PDF) 70 Page - ATMEL Corporation |
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ATTINY2313-20MU Datasheet(HTML) 70 Page - ATMEL Corporation |
70 / 231 page 70 ATtiny2313/V 2543I–AVR–04/06 Figure 30. Compare Match Output Unit, Schematic The general I/O port function is overridden by the Output Compare (OC0x) from the Waveform Generator if either of the COM0x1:0 bits are set. However, the OC0x pin direction (input or output) is still controlled by the Data Direction Register (DDR) for the port pin. The Data Direction Register bit for the OC0x pin (DDR_OC0x) must be set as output before the OC0x value is visible on the pin. The port override function is indepen- dent of the Waveform Generation mode. The design of the Output Compare pin logic allows initialization of the OC0x state before the output is enabled. Note that some COM0x1:0 bit settings are reserved for certain modes of operation. See “8-bit Timer/Counter Register Description” on page 77. Compare Output Mode and Waveform Generation The Waveform Generator uses the COM0x1:0 bits differently in Normal, CTC, and PWM modes. For all modes, setting the COM0x1:0 = 0 tells the Waveform Generator that no action on the OC0x Register is to be performed on the next Compare Match. For com- pare output actions in the non-PWM modes refer to Figure 29 on page 68. For fast PWM mode, refer to Table 26 on page 58, and for phase correct PWM refer to Table 27 on page 58. A change of the COM0x1:0 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 FOC0x 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 (WGM02:0) and Compare Output mode (COM0x1:0) bits. The Compare Output mode bits do not affect the counting sequence, while the Waveform Generation mode bits do. The COM0x1:0 bits control whether the PWM output generated should be inverted or not (inverted or non-inverted PWM). For non-PWM modes the COM0x1:0 bits control whether the out- put should be set, cleared, or toggled at a Compare Match (See “Compare Match Output Unit” on page 69.). For detailed timing information refer to Figure 34, Figure 35, Figure 36 and Figure 37 in “Timer/Counter Timing Diagrams” on page 75. PORT DDR DQ DQ OCn Pin OCnx DQ Waveform Generator COMnx1 COMnx0 0 1 FOCn clk I/O |
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