Extract IC ATmega128V Software from its embedded flash and eeprom memory, the protection system of MCU ATmega128V will be breakdown and the source code Microcontroller ATmega128V will be cloned to new MCU;
The general I/O port function is overridden by the Output Compare (OCnx) from the waveform Generator if either of the COMnx1:0 bits are set. However, the OCnx 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 OCnx pin (DDR_OCnx) must be set as output before the OCnx value is visible on the pin.
The port override function is generally independent of the Waveform Generation mode, but there are some exceptions. Refer to Table 79, Table 80 and Table 81 for details.
The design of the Output Compare pin logic allows initialization of the OCnx state before the output is enabled. Note that some COMnx1:0 bit settings are reserved for certain modes of operation. See “16-bit Timer/Counter Register Description” on page 157.
The COMnx1:0 bits have no effect on the Input Capture unit. The Waveform Generator uses the COMnx1:0 bits differently in normal, CTC, and PWM modes. For all modes, setting the COMnx1:0 = 0 tells the Waveform Generator that no action on the OCnx Register is to be performed on the next compare match. For compare output actions in the non-PWM modes refer to Table 79 on page 158. For fast PWM mode refer to Table 80 on page 158, and for phase correct and phase and frequency correct PWM refer to Table 81 on page 159.
A change of the COMnx1:0 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 FOCnx strobe bits.
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 (WGMn3:0) and Compare Output mode (COMnx1:0) bits. The Compare Output mode bits do not affect the counting sequence, while the Waveform Generation mode bits do.
The COMnx1:0 bits control whether the PWM output generated should be inverted or not (inverted or non-inverted PWM). For non-PWM modes the COMnx1:0 bits control whether the output should be set, cleared or toggle at a compare match (See “Compare Match Output Unit” on page 146.) For detailed timing information refer to “Timer/Counter Timing Diagrams” on page 154.
