ATtiny43U Atmel Corporation, ATtiny43U Datasheet - Page 47

• 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

8.11
8.11.1
8048B–AVR–03/09
Register Description
ADCSRB – ADC Control and Status Register B
boost converter, connect pins V
directly to the V
• Bit 7 – BS: Boost Status
The BS bit can be used to identify silent periods of the boost converter. When this bit is one the
boost converter is active and switching, i.e. it is either in Active Regulated Mode, or in the switch-
ing period of Active Low Current Mode. When this bit is zero the boost converter is not switching,
i.e. it is either in Stop Mode or in the non-switching period of Active Low Current Mode.
Alternatively, the BS bit can be programmed to return the state of the duty cycle controller, as
follows:
If the BS bit now is zero the converter is operating in normal duty cycle control mode. If the bit is
one the converter is working in full duty cycle mode.
Bit
0x03 (0x23)
Read/Write
Initial Value
1. Write 11xx xxxx to register PRR
2. Within 3 clock cycles of the above, write 10xx xxxx to register PRR
3. Wait (issue a single-cycle no operation)
4. Within 5 clock cycles of first write, read the BS bit
CC
BS
R
7
0
pin.
ACME
R/W
6
0
BAT
R/W
5
–
0
and LSW to ground and provide the device with supply
ADLAR
R/W
4
0
R/W
3
–
0
ADTS2
R/W
2
0
ADTS1
R/W
1
0
ADTS0
R/W
0
0
ADCSRB
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