AT90PWM3B Atmel Corporation, AT90PWM3B Datasheet - Page 214

• Manufacturer Part Number: AT90PWM3B
• Manufacturer: Atmel Corporation

Specifications of AT90PWM3B

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 3
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 105
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 5
• Output Compare Channels: 16
• Input Capture Channels: 1
• Pwm Channels: 12
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

The maximum counter value is given by the following formula:
MUBRR[H:L]=F
/ (baud rate frequency)
CLKIO
MBURR[H:L] is used to calibrate the detect window of the start bit and to detect time overflow of
the other bits.
19.3.4
Double Speed Operation (U2X)
Double Speed Operation is controlled by U2X bit in UCSRA.
See “Double Speed Operation
(U2X)” on page 186.
This mode of operation is not allowed in manchester bit coding.
Each ‘bit time’ in the Manchester serial frame is divided into two phases (See
Figure
19-4). The
counter counts during the first phase and counts down during the second one. When the data bit
transition is detected, the counter memorises the N1 counter value and start counting down.
When the counter reaches the zero value, it starts counting up again and the N1/2 value allows
to open the next detection window. This detection window defines the time zone where the next
data bit edge is sampled.
AT90PWM2/3/2B/3B
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