PIC16C711-20/SO【PDF 67/177 页】IC MCU OTP 1KX14 A/D 18SOIC

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Sheet目录3861

63页 64页 65页 66页 [67页]68页 69页 70页 71页

159

7593L–AVR–09/12

AT90USB64/128

Notes:

1. MAX= 0xFF

2. BOTTOM= 0x00

16.8.2

TCCR2B – Timer/Counter Control Register B

Bit 7 – FOC2A: Force Output Compare A

The FOC2A bit is only active when the WGM bits specify a non-PWM mode.

However, for ensuring compatibility with future devices, this bit must be set to zero when

TCCR2B is written when operating in PWM mode. When writing a logical one to the FOC2A bit,

an immediate Compare Match is forced on the Waveform Generation unit. The OC2A output is

changed according to its COM2A1:0 bits setting. Note that the FOC2A bit is implemented as a

strobe. Therefore it is the value present in the COM2A1:0 bits that determines the effect of the

forced compare.

A FOC2A strobe will not generate any interrupt, nor will it clear the timer in CTC mode using

OCR2A as TOP.

The FOC2A bit is always read as zero.

Bit 6 – FOC2B: Force Output Compare B

The FOC2B bit is only active when the WGM bits specify a non-PWM mode.

However, for ensuring compatibility with future devices, this bit must be set to zero when

TCCR2B is written when operating in PWM mode. When writing a logical one to the FOC2B bit,

an immediate Compare Match is forced on the Waveform Generation unit. The OC2B output is

changed according to its COM2B1:0 bits setting. Note that the FOC2B bit is implemented as a

strobe. Therefore it is the value present in the COM2B1:0 bits that determines the effect of the

forced compare.

A FOC2B strobe will not generate any interrupt, nor will it clear the timer in CTC mode using

OCR2B as TOP.

The FOC2B bit is always read as zero.

Bits 5:4 – Res: Reserved bits

These bits are reserved bits in the AT90USB64/128 and will always read as zero.

Bit 3 – WGM22: Waveform Generation mode

See the description in the “TCCR2A – Timer/Counter Control Register A” on page 156.

PWM, phase correct

OCRA

TOP

BOTTOM

110

Reserved

–

111

Fast PWM

OCRA

TOP

Table 16-7.

Waveform Generation mode bit description. (Continued)

Mode

WGM2

WGM1

WGM0

Timer/Counter

mode of operation

TOP

Update of

OCRx at

TOV flag

set on

(1)(2)

Bit

543

FOC2A

FOC2B

–

WGM22

CS22

CS21

CS20

TCCR2B

Read/write

R/W

Initial value

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