Rainbow-electronics ATtiny2313 Instrukcja Użytkownika Pobierz pdf (Strona 79)

ATtiny2313

2543A–AVR–08/03

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.

Timer/Counter Register –

TCNT0

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 OCR0x Registers.

Output Compare Register A –

OCR0A

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.

Output Compare Register B –

OCR0B

The Output Compare Register B 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 OC0B pin.

Timer/Counter Interrupt Mask

• Bit 2 – OCIE0B: Timer/Counter0 Output Compare Match B Interrupt Enable

When the OCIE0B bit is written to one, and the I-bit in the Status Register is set, the

Timer/Counter Compare Match B interrupt is enabled. The corresponding interrupt is

executed if a Compare Match in Timer/Counter occurs, i.e., when the OCF0B bit is set in

the Timer/Counter Interrupt Flag Register – TIFR.

101clk

I/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.

Table 42. Clock Select Bit Description (Continued)

CS02 CS01 CS00 Description

Bit 76543210

TCNT0[7:0] TCNT0

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value00000000

Bit 76543210

OCR0A[7:0] OCR0A

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value00000000

Bit 76543210

OCR0B[7:0] OCR0B

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value00000000

Bit 76543210

TOIE1 OCIE1A OCIE1B – ICIE1 OCIE0B TOIE0 OCIE0A TIMSK

Read/WriteRRRRR/WR/WR/WR

Initial Value00000000

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 210 211

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