AT90PWM216 Atmel Corporation, AT90PWM216 Datasheet - Page 217
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AT90PWM216
Manufacturer Part Number
AT90PWM216
Description
Manufacturer
Atmel Corporation
Specifications of AT90PWM216
Flash (kbytes)
16 Kbytes
Pin Count
24
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
19
Ext Interrupts
4
Usb Speed
No
Usb Interface
No
Spi
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
2
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
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
4
Output Compare Channels
12
Input Capture Channels
1
Pwm Channels
7
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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19.3.4
7710F–AVR–09/11
Double Speed Operation (U2X)
The number of data bits to be received can be configured with the URxS bits of EUCSRA
register.
The Manchester decoder provides a special mode where 16 or 17 data bits can be received. In
this mode the Manchester decoder can automatically detects if the seventeenth bit is Man-
chester encoded or not (seventeenth data bit or first stop bit). If the receiver detects a valid data
bit (Manchester transition) during the seventeenth bit time of the frame, the receiver will process
the frame as a 17-bit frame lenght and set the F1617 bit of EUCSRC register.
In Manchester mode, the clock used for sampling the EUSART input signal is programmed by
the baudrate generator.
The edge detector of the Manchester decoder is based upon a 16 bits up/down counter which
maximum value can be configured through the MUBRRH and MUBRRL registers.
The maximum counter value is given by the following formula:
MUBRR[H:L]=F
MBURR[H:L] is used to calibrate the detect window of the start bit and to detect time overflow of
the other bits.
Double Speed Operation is controlled by U2X bit in UCSRA.
(U2X)” on page 189.
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
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.
Figure 19-4. Manchester Decoder operation
Note:
N1 = MBURR[H:L]/2
CLKIO
/ (baud rate frequency)
AT90PWM216/316
See “Double Speed Operation
Figure
19-4). The
217
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