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ATtiny44 Datasheet(PDF) 83 Page - ATMEL Corporation

No. de pieza ATtiny44
Descripción Electrónicos  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  236 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny44 Datasheet(HTML) 83 Page - ATMEL Corporation

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83
8006H–AVR–10/09
ATtiny24/44/84
Note:
1. MAX
= 0xFF
BOTTOM = 0x00
11.9.2
TCCR0B – Timer/Counter Control Register B
• Bit 7 – FOC0A: Force Output Compare A
The FOC0A 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
TCCR0B is written when operating in PWM mode. When writing a logical one to the FOC0A bit,
an immediate Compare Match is forced on the Waveform Generation unit. The OC0A output is
changed according to its COM0A1:0 bits setting. Note that the FOC0A bit is implemented as a
strobe. Therefore it is the value present in the COM0A1:0 bits that determines the effect of the
forced compare.
A FOC0A strobe will not generate any interrupt, nor will it clear the timer in CTC mode using
OCR0A as TOP.
The FOC0A bit is always read as zero.
• Bit 6 – FOC0B: Force Output Compare B
The FOC0B 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
TCCR0B is written when operating in PWM mode. When writing a logical one to the FOC0B bit,
an immediate Compare Match is forced on the Waveform Generation unit. The OC0B output is
changed according to its COM0B1:0 bits setting. Note that the FOC0B bit is implemented as a
strobe. Therefore it is the value present in the COM0B1:0 bits that determines the effect of the
forced compare.
Table 11-8.
Waveform Generation Mode Bit Description
Mode
WGM02
WGM01
WGM00
Timer/Counter
Mode of Operation
TOP
Update of
OCRx at
TOV Flag
Set on
(1)
0
000
Normal
0xFF
Immediate
MAX
1
001
PWM, Phase
Correct
0xFF
TOP
BOTTOM
2
0
1
0
CTC
OCRA
Immediate
MAX
3
011
Fast PWM0xFF
BOTTOM
MAX
4
100
Reserved
–
–
–
5
101
PWM, Phase
Correct
OCRA
TOP
BOTTOM
6
110
Reserved
–
–
–
7
111
Fast PWMOCRA
BOTTOM
TOP
Bit
7
6
5
4
3
2
1
0
0x33 (0x53)
FOC0A
FOC0B
–
–
WGM02
CS02
CS01
CS00
TCCR0B
Read/Write
WW
RR
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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