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ATtiny43U датащи(PDF) 93 Page - ATMEL Corporation

номер детали ATtiny43U
подробное описание детали  8-bit Microcontroller with 4K Bytes In-System Programmable Flash and Boost Converter
PDF  182 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny43U датащи(HTML) 93 Page - ATMEL Corporation

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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
1
001
PWM, Phase
Correct
0xFF
TOP
BOTTOM
2
0
1
0
CTC
OCRnA
Immediate
MAX
3
0
1
1
Fast PWM
0xFF
TOP
MAX
4
100
Reserved
–
–
–
5
101
PWM, Phase
Correct
OCRnA
TOP
BOTTOM
6
110
Reserved
–
–
–
7
111
Fast PWM
OCRnA
TOP
TOP
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



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