ATMEGA8515L_14 Datasheet, PDF (82/257 Pages) ATMEL Corporation – Nonvolatile Program and Data Memories

Output Compare Unit
clk_Tn
top
Timer/Counter clock, referred to as clk_T0 in the following.
Signalize that TCNT0 has reached maximum value.
bottom Signalize that TCNT0 has reached minimum value (zero).
Depending of the mode of operation used, the counter is cleared, incremented, or dec-
remented at each timer clock (clk_T0). clk_T0 can be generated from an external or internal
clock source, selected by the Clock Select bits (CS02:0). When no clock source is
selected (CS02:0 = 0) the timer is stopped. However, the TCNT0 value can be accessed
by the CPU, regardless of whether clk_T0 is present or not. A CPU write overrides (has
priority over) all counter clear or count operations.
The counting sequence is determined by the setting of the WGM01 and WGM00 bits
located in the Timer/Counter Control Register (TCCR0). There are close connections
between how the counter behaves (counts) and how waveforms are generated on the
Output Compare output OC0. For more details about advanced counting sequences
and waveform generation, see “Modes of Operation” on page 85.
The Timer/Counter Overflow (TOV0) Flag is set according to the mode of operation
selected by the WGM01:0 bits. TOV0 can be used for generating a CPU interrupt.
The 8-bit comparator continuously compares TCNT0 with the Output Compare Register
(OCR0). Whenever TCNT0 equals OCR0, the comparator signals a match. A match will
set the Output Compare Flag (OCF0) at the next timer clock cycle. If enabled (OCIE0 =
1 and Global Interrupt Flag in SREG is set), the Output Compare Flag generates an out-
put compare interrupt. The OCF0 Flag is automatically cleared when the interrupt is
executed. Alternatively, the OCF0 Flag can be cleared by software by writing a logical
one to its I/O bit location. The waveform generator uses the match signal to generate an
output according to operating mode set by the WGM01:0 bits and Compare Output
mode (COM01:0) bits. The max 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 85.
Figure 36 shows a block diagram of the output compare unit.
Figure 36. Output Compare Unit, Block Diagram
DATA BUS
82 ATmega8515(L)
OCRn
TCNTn
top
bottom
FOCn
= (8-bit Comparator )
OCFn (Int.Req.)
Waveform Generator
OCn
WGMn1:0 COMn1:0
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