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ATmega88 Datasheet(PDF) 150 Page - ATMEL Corporation

Part # ATmega88
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  340 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega88 Datasheet(HTML) 150 Page - ATMEL Corporation

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7530H–AVR–02/09
ATmega48/88/168 Automotive
If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the
counter even if the pin is configured as an output. This feature allows software control of the
counting.
15.8.3
Timer/Counter Register – TCNT2
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter. Writing to the TCNT2 Register blocks (removes) the Compare
Match on the following timer clock. Modifying the counter (TCNT2) while the counter is running,
introduces a risk of missing a Compare Match between TCNT2 and the OCR2x Registers.
15.8.4
Output Compare Register A – OCR2A
The Output Compare Register A contains an 8-bit value that is continuously compared with the
counter value (TCNT2). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC2A pin.
15.8.5
Output Compare Register B – OCR2B
The Output Compare Register B contains an 8-bit value that is continuously compared with the
counter value (TCNT2). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC2B pin.
Table 15-8.
Clock Select Bit Description
CS22
CS21
CS20
Description
0
0
0
No clock source (Timer/Counter stopped).
001
clkT2S/(No prescaling)
010
clkT2S/8 (From prescaler)
011
clkT2S/32 (From prescaler)
100
clkT2S/64 (From prescaler)
101
clkT2S/128 (From prescaler)
110
clk
T
2S/256 (From prescaler)
111
clkT2S/1024 (From prescaler)
Bit
76543210
TCNT2[7:0]
TCNT2
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000
Bit
76543210
OCR2A[7:0]
OCR2A
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000
Bit
76543210
OCR2B[7:0]
OCR2B
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000



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