ATxmega64A1 Atmel Corporation, ATxmega64A1 Datasheet - Page 244
ATxmega64A1
Manufacturer Part Number
ATxmega64A1
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A1
Flash (kbytes)
64 Kbytes
Pin Count
100
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
78
Ext Interrupts
78
Usb Speed
No
Usb Interface
No
Spi
12
Twi (i2c)
4
Uart
8
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
4
Resistive Touch Screen
No
Dac Channels
4
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
External Bus Interface
1
Dram Memory
sdram
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
8
Output Compare Channels
24
Input Capture Channels
24
Pwm Channels
24
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
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21.8.2
21.8.3
8077H–AVR–12/09
Asynchronous Data Recovery
Asynchronous Operational Range
The data recovery unit uses sixteen samples in Normal mode and eight samples in Double
Speed mode for each bit.
ity bits.
Figure 21-7. Sampling of Data and Parity Bit
As for start bit detection, identical majority voting technique is used on the three center samples
(indicated with sample numbers inside boxes) for deciding of the logic level of the received bit.
This majority voting process acts as a low pass filter for the received signal on the RxD pin. The
process is repeated for each bit until a complete frame is received. Including the first, but exclud-
ing additional stop bits. If the stop bit sampled has a logic 0 value, the Frame Error (FERR) Flag
will be set.
Figure 21-8 on page 244
beginning of the next frame's start bit.
Figure 21-8. Stop Bit Sampling and Next Start Bit Sampling
A new high to low transition indicating the start bit of a new frame can come right after the last of
the bits used for majority voting. For Normal Speed mode, the first low level sample can be at
point marked (A) in Stop Bit Sampling and Next Start Bit Sampling. For Double Speed mode the
first low level must be delayed to (B). (C) marks a stop bit of full length at nominal baud rate. The
early start bit detection influences the operational range of the Receiver.
The operational range of the Receiver is dependent on the mismatch between the received bit
rate and the internally generated baud rate. If an external Transmitter is sending on bit rates that
are too fast or too slow, or the internally generated baud rate of the Receiver does not match the
external source’s base frequency, the Receiver will not be able to synchronize the frames to the
start bit.
(CLK2X = 0)
(CLK2X = 1)
(CLK2X = 0)
(CLK2X = 1)
Sample
Sample
Sample
Sample
RxD
RxD
1
1
1
1
Figure 21-7 on page 244
2
2
shows the sampling of the stop bit in relation to the earliest possible
3
2
3
2
4
4
5
3
5
3
6
6
7
4
7
4
8
8
STOP 1
shows the sampling process of data and par-
BIT n
9
5
9
5
10
10
(A)
0/1
11
6
6
0/1
12
(B)
0/1
0/1
13
7
14
15
8
XMEGA A
16
(C)
1
1
244
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