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ATmega325P датащи(PDF) 104 Page - ATMEL Corporation

номер детали ATmega325P
подробное описание детали  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P датащи(HTML) 104 Page - ATMEL Corporation

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104
8023F–AVR–07/09
ATmega325P/3250P
• Bit 2:0 – CS02:0: Clock Select
The three Clock Select bits select the clock source to be used by the Timer/Counter.
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.
14.10.2
TCNT0 – Timer/Counter Register
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter. Writing to the TCNT0 Register blocks (removes) the compare
match on the following timer clock. Modifying the counter (TCNT0) while the counter is running,
introduces a risk of missing a compare match between TCNT0 and the OCR0A Register.
14.10.3
OCR0A – Output Compare Register A
The Output Compare Register A contains an 8-bit value that is continuously compared with the
counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC0A pin.
14.10.4
TIMSK0 – Timer/Counter 0 Interrupt Mask Register
Table 14-6.
Clock Select Bit Description
CS02
CS01
CS00
Description
0
0
0
No clock source (Timer/Counter stopped)
001
clkI/O/(No prescaling)
010
clkI/O/8 (From prescaler)
011
clkI/O/64 (From prescaler)
100
clkI/O/256 (From prescaler)
101
clkI/O/1024 (From prescaler)
1
1
0
External clock source on T0 pin. Clock on falling edge.
1
1
1
External clock source on T0 pin. Clock on rising edge.
Bit
765
4321
0
0x26 (0x46)
TCNT0[7:0]
TCNT0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
000
0000
0
Bit
7
65
43
21
0
0x27 (0x47)
OCR0A[7:0]
OCR0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
765
432
1
0
(0x6E)
–
–
–
–
–
–
OCIE0A
TOIE0
TIMSK0
Read/Write
RRRRR
R
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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