PIC16C711-20/SO【PDF 69/177 页】IC MCU OTP 1KX14 A/D 18SOIC

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160

7593L–AVR–09/12

AT90USB64/128

Bit 2:0 – CS22:0: Clock Select

The three Clock Select bits select the clock source to be used by the Timer/Counter, see Table

16-8.

16.8.3

TCNT2 – 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 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.

16.8.4

OCR2A – Output Compare Register A

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.

16.8.5

OCR2B – Output Compare Register B

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 16-8.

Clock Select bit description.

CS22

CS21

CS20

Description

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

clkT2S/256 (from prescaler)

111

clk

2S/1024 (from prescaler)

Bit

TCNT2[7:0]

TCNT2

Read/write

R/W

Initial value

Bit

OCR2A[7:0]

OCR2A

Read/write

R/W

Initial value

Bit

OCR2B[7:0]

OCR2B

Read/write

R/W

Initial value

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