ATMEGA169P-16MCU【PDF 7/274 页】MCU AVR 16K ISP FLSH 16MHZ 64QFN

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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

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)

External clock source on T0 pin. Clock on falling edge.

External clock source on T0 pin. Clock on rising edge.

Bit

765

432

0x26 (0x46)

TCNT0[7:0]

TCNT0

Read/Write

R/W

Initial Value

Bit

765

432

0x27 (0x47)

OCR0A[7:0]

OCR0A

Read/Write

R/W

Initial Value

Bit

7654

(0x6E)

–

–OCIE0A

TOIE0

TIMSK0

Read/Write

RRR

R/W

Initial Value

0000

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