118
9140CINDCO02/10
ATA8741
21.8 Compare Match Output Unit
The Compare Output mode (COM1x1:0) bits have two functions. The Waveform Generator 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. Figure 21-5 on page 118
shows a simplified schematic of the logic affected by the COM1x1:0 bit setting. The I/O Regis-
ters, 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 21-5. 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. See Table 21-1 on page 129, Table 21-2 on page 129
and Table 21-3 on page 130 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 Register Description on page 129
The COM1x1:0 bits have no effect on the Input Capture unit.
PORT
DDR
D Q
D Q
OCnx
Pin
OCnx
D Q
Waveform
Generator
OMnx1
OMnx0
0
1
OCnx
clk
I
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