ATtiny43U Atmel Corporation, ATtiny43U Datasheet - Page 93

• Manufacturer Part Number: ATtiny43U
• Manufacturer: Atmel Corporation

Specifications of ATtiny43U

• Flash (kbytes): 4 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 8 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Eeprom (bytes): 64
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 0.7 to 5.5
• Operating Voltage (vcc): 0.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

12.9.3
12.9.4
8048B–AVR–03/09
TCCR0B – Timer/Counter Control Register B
TCCR1B – Timer/Counter Control Register B
Table 12-8.
Note:
• 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.
Bit
0x33 (0x53)
Read/Write
Initial Value
Bit
0x2E (0x4E)
Read/Write
Initial Value
Mode
0
1
2
3
4
5
6
7
1. MAX = 0xFF, BOTTOM = 0x00
WGMn2
0
0
0
0
1
1
1
1
Waveform Generation Mode Bit Description
FOC0A
FOC1A
W
W
7
0
7
0
WGMn1
0
0
1
1
0
0
1
1
FOC0B
FOC1B
W
W
6
0
6
0
WGMn0
0
1
0
1
0
1
0
1
R
R
5
–
0
5
–
0
Timer/Counter
Mode of
Operation
Normal
PWM, Phase
Correct
CTC
Fast PWM
Reserved
PWM, Phase
Correct
Reserved
Fast PWM
R
R
4
–
0
4
–
0
WGM02
WGM12
R/W
R/W
3
0
3
0
OCRnA
OCRnA
OCRnA
0xFF
0xFF
0xFF
TOP
–
–
CS02
CS12
R/W
R/W
2
0
2
0
Immediate
Immediate
Update of
OCRx at
CS01
CS11
R/W
R/W
TOP
TOP
TOP
TOP
1
0
1
0
–
–
CS00
CS10
R/W
R/W
0
0
0
0
TOV Flag
BOTTOM
BOTTOM
Set on
MAX
MAX
MAX
TOP
–
–
TCCR0B
TCCR1B
(1)
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