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104
8018P–AVR–08/10
ATmega169P
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.
14.9.2
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.
14.9.3
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.
14.9.4
TIMSK0 – Timer/Counter 0 Interrupt Mask Register
Table 14-6.
Clock Select Bit Description
CS02
CS01
CS00
Description
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
0
External clock source on T0 pin. Clock on falling edge.
1
External clock source on T0 pin. Clock on rising edge.
Bit
765
432
10
0x26 (0x46)
TCNT0[7:0]
TCNT0
Read/Write
R/W
Initial Value
0
Bit
765
432
10
0x27 (0x47)
OCR0A[7:0]
OCR0A
Read/Write
R/W
Initial Value
0
Bit
7654
32
1
0
(0x6E)
–
–OCIE0A
TOIE0
TIMSK0
Read/Write
RRR
R/W
Initial Value
0000
00
0
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