ATTINY45-20MUR Atmel, ATTINY45-20MUR Datasheet - Page 82
![MCU AVR 4KB FLASH 20MHZ 20QFN](/photos/6/87/68751/313-20-qfn_sml.jpg)
ATTINY45-20MUR
Manufacturer Part Number
ATTINY45-20MUR
Description
MCU AVR 4KB FLASH 20MHZ 20QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY45-20MUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
6
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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11.9.3
82
ATtiny25/45/85
TCCR0B – Timer/Counter Control Register B
Table 11-5.
Notes:
• 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 COM0A[1:0] bits setting. Note that the FOC0A bit is implemented as a
strobe. Therefore it is the value present in the COM0A[1:0] 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 COM0B[1:0] bits setting. Note that the FOC0B bit is implemented as a
strobe. Therefore it is the value present in the COM0B[1:0] bits that determines the effect of the
forced compare.
A FOC0B strobe will not generate any interrupt, nor will it clear the timer in CTC mode using
OCR0B as TOP.
Bit
0x33
Read/Write
Initial Value
Mode
0
1
2
3
4
5
6
7
1. MAX
2. BOTTOM = 0x00
WGM
02
0
0
0
0
1
1
1
1
Waveform Generation Mode Bit Description
FOC0A
W
7
0
WGM
01
= 0xFF
0
0
1
1
0
0
1
1
FOC0B
W
6
0
WGM
00
0
1
0
1
0
1
0
1
Timer/Counter Mode
of Operation
Normal
PWM, Phase Correct
CTC
Fast PWM
Reserved
PWM, Phase Correct
Reserved
Fast PWM
R
5
–
0
R
4
–
0
WGM02
R/W
3
0
OCRA
OCRA
OCRA
0xFF
0xFF
0xFF
TOP
CS02
R/W
–
–
2
0
BOTTOM
BOTTOM
Update of
Immediate
Immediate
OCRx at
CS01
R/W
1
0
TOP
TOP
–
–
(2)
(2)
CS00
R/W
0
0
2586M–AVR–07/10
BOTTOM
BOTTOM
TOV Flag
Set on
MAX
MAX
MAX
TOP
TCCR0B
–
–
(1)
(1)
(1)
(2)
(2)
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