Rainbow-electronics ATtiny43U Uživatelský manuál stáhnout pdf (Strana 93)

8048B–AVR–03/09

Note: 1. MAX = 0xFF, BOTTOM = 0x00

12.9.3 TCCR0B – Timer/Counter Control Register B

12.9.4 TCCR1B – Timer/Counter Control Register B

• Bit 7 – FOCnA: Force Output Compare A

The FOCnA 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

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

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

changed according to its COMnA1:0 bits setting. Note that the FOCnA bit is implemented as a

strobe. Therefore it is the value present in the COMnA1:0 bits that determines the effect of the

forced compare.

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

OCRnA as TOP.

The FOCnA bit is always read as zero.

• Bit 6 – FOCnB: Force Output Compare B

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

Table 12-8. Waveform Generation Mode Bit Description

Mode WGMn2 WGMn1 WGMn0

Timer/Counter

Mode of

Operation TOP

Update of

OCRx at

TOV Flag

Set on

(1)

0 0 0 0 Normal 0xFF Immediate MAX

1001

PWM, Phase

Correct

0xFF TOP BOTTOM

2 0 1 0 CTC OCRnA Immediate MAX

3 0 1 1 Fast PWM 0xFF TOP MAX

4100Reserved – – –

5101

PWM, Phase

Correct

OCRnA TOP BOTTOM

6110Reserved – – –

7111Fast PWMOCRnATOPTOP

Bit 7 6 5 4 3 2 1 0

0x33 (0x53)

FOC0A FOC0B – – WGM02 CS02 CS01 CS00 TCCR0B

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

Initial Value 0 0 0 0 0 0 0 0

Bit 7 6 5 4 3 2 1 0

0x2E (0x4E)

FOC1A FOC1B – – WGM12 CS12 CS11 CS10 TCCR1B

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

Initial Value 0 0 0 0 0 0 0 0

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 181 182

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