ATEMGA128-16AI View Datasheet(PDF) - Atmel Corporation
Part Name
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MFG CO.
'ATEMGA128-16AI' PDF : 395 Pages View PDF
Output Compare Units
(ICFn) must be cleared by software (writing a logical one to the I/O bit location). For
measuring frequency only, the clearing of the ICFn flag is not required (if an interrupt
handler is used).
The 16-bit comparator continuously compares TCNTn with the Output Compare Regis-
ter (OCRnx). If TCNT equals OCRnx the comparator signals a match. A match will set
the Output Compare Flag (OCFnx) at the next timer clock cycle. If enabled (OCIEnx =
1), the output compare flag generates an output compare interrupt. The OCFnx flag is
automatically cleared when the interrupt is executed. Alternatively the OCFnx flag can
be cleared by software by writing a logical one to its I/O bit location. The Waveform Gen-
erator uses the match signal to generate an output according to operating mode set by
the Waveform Generation mode (WGMn3:0) bits and Compare Output mode
(COMnx1:0) bits. The TOP and BOTTOM signals are used by the waveform generator
for handling the special cases of the extreme values in some modes of operation (See
“Modes of Operation” on page 123.)
A special feature of output compare unit A allows it to define the Timer/Counter TOP
value (i.e., counter resolution). In addition to the counter resolution, the TOP value
defines the period time for waveforms generated by the waveform generator.
Figure 49 shows a block diagram of the output compare unit. The small “n” in the regis-
ter and bit names indicates the device number (n = n for Timer/Counter n), and the “x”
indicates output compare unit (A/B/C). The elements of the block diagram that are not
directly a part of the output compare unit are gray shaded.
Figure 49. Output Compare Unit, Block Diagram
DATABUS (8-bit)
TEMP (8-bit)
OCRnxH Buf. (8-bit) OCRnxL Buf. (8-bit)
OCRnx Buffer (16-bit Register)
TCNTnH (8-bit) TCNTnL (8-bit)
TCNTn (16-bit Counter)
OCRnxH (8-bit)
OCRnxL (8-bit)
OCRnx (16-bit Register)
TOP
BOTTOM
=(16-bit Comparator )
OCFnx (Int.Req.)
Waveform Generator
WGMn3:0 COMnx1:0
OCnx
120 ATmega128
2467O–AVR–10/06
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