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ATMEGA8-16AI Datasheet(PDF) 85 Page - ATMEL Corporation |
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ATMEGA8-16AI Datasheet(HTML) 85 Page - ATMEL Corporation |
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85 / 303 page  85 ATmega8(L) 2486M–AVR–12/03 Compare Match Output Unit The Compare Output mode (COM1x1:0) bits have two functions. The waveform genera- tor uses the COM1x1:0 bits for defining the Output Compare (OC1x) state at the next Compare Match. Secondly the COM1x1:0 bits control the OC1x pin output source. Fig- ure 36 shows a simplified schematic of the logic affected by the COM1x1:0 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 COM1x1:0 bits are shown. When referring to the OC1x state, the reference is for the internal OC1x Register, not the OC1x pin. If a System Reset occur, the OC1x Register is reset to “0”. Figure 36. 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 output) 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 visible on the pin. The port override function is generally independent of the Waveform Generation mode, but there are some exceptions. Refer to Table 36, Table 37 and Table 38 for details. The design of the Output Compare Pin logic allows initialization of the OC1x state before the output 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 95. The COM1x1:0 bits have no effect on the Input Capture unit. PORT DDR DQ DQ OCnx Pin OCnx DQ Waveform Generator COMnx1 COMnx0 0 1 FOCnx clk I/O |
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