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ATMEGA8515-16AU Datasheet(PDF) 83 Page - ATMEL Corporation |
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ATMEGA8515-16AU Datasheet(HTML) 83 Page - ATMEL Corporation |
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83 / 254 page  83 ATmega8515(L) 2512G–AVR–03/05 Compare Match Output Unit The Compare Output mode (COM01:0) bits have two functions. The Waveform Genera- tor uses the COM01:0 bits for defining the Output Compare (OC0) state at the next Compare Match. Also, the COM01:0 bits control the OC0 pin output source. Figure 37 shows a simplified schematic of the logic affected by the COM01:0 bit setting. The I/O Registers, I/O bits, and I/O pins in the figure are shown in bold. Only the parts of the general I/O port Control Registers (DDR and PORT) that are affected by the COM01:0 bits are shown. When referring to the OC0 state, the reference is for the internal OC0 Register, not the OC0 pin. If a System Reset occur, the OC0 Register is reset to “0”. Figure 37. Compare Match Output Unit, Schematics The general I/O port function is overridden by the output compare (OC0) from the Wave- form Generator if either of the COM01:0 bits are set. However, the OC0 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 OC0 pin (DDR_OC0) must be set as output before the OC0 value is visible on the pin. The port override function is independent of the Waveform Generation mode. The design of the output compare pin logic allows initialization of the OC0 state before the output is enabled. Note that some COM01:0 bit settings are reserved for certain modes of operation. See “8-bit Timer/Counter Register Description” on page 90. Compare Output Mode and Waveform Generation The waveform generator uses the COM01:0 bits differently in Normal, CTC, and PWM modes. For all modes, setting the COM01:0 = 0 tells the Waveform Generator that no action on the OC0 Register is to be performed on the next Compare Match. For com- pare output actions in the non-PWM modes refer to Table 45 on page 91. For fast PWM mode, refer to Table 46 on page 91, and for phase correct PWM refer to Table 47 on page 91. A change of the COM01:0 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 FOC0 strobe bits. PORT DDR DQ DQ OCn Pin OCn DQ Waveform Generator COMn1 COMn0 0 1 FOCn clk I/O |
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