ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 278

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 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: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• 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
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8291A–AVR–10/11
Table 21-3
tolerated. Normal speed mode has higher tolerance of baud rate variations.
Table 21-3.
Table 21-4.
The recommendations for the maximum receiver baud rate error assume that the receiver and
transmitter equally divide the maximum total error.
D
S
S
S
R
R
#(Data + Parity Bit)
#(Data + Parity Bit)
F
M
slow
fast
R
Sum of character size and parity size (D = 5 to 10 bits).
Samples per bit. S = 16 for normal speed mode and S = 8 for double speed mode.
First sample number used for majority voting. S
ble speed mode.
Middle sample number used for majority voting. S
double speed mode.
The ratio of the slowest incoming data rate that can be accepted in relation to the receiver baud
rate.
The ratio of the fastest incoming data rate that can be accepted in relation to the receiver baud
rate.
10
10
slow
D
D
5
6
7
8
9
5
6
7
8
9
and
Recommended maximum receiver baud rate error for normal speed mode
Recommended maximum receiver baud rate error for double speed mode
=
Table 21-4 on page 278
------------------------------------------ -
S 1
–
(
D
+
+
D S ⋅
R
R
slow
slow
1
93.20
94.12
94.81
95.36
95.81
96.17
94.12
94.92
95.52
96.00
96.39
96.70
)S
+
(%)
(%)
S
F
R
R
106.67
105.79
105.11
104.58
104.14
103.78
105.66
104.92
104.35
103.90
103.53
103.23
fast
fast
list the maximum receiver baud rate error that can be
(%)
(%)
Max Total Error (%)
Max Total Error (%)
F
= 8 for normal speed mode and S
+6.67/-6.80
+5.79/-5.88
+5.11/-5.19
+4.58/-4.54
+4.14/-4.19
+3.78/-3.83
+5.66/-5.88
+4.92/-5.08
+4.35/-4.48
+3.90/-4.00
+3.53/-3.61
+3.23/-3.30
M
Atmel AVR XMEGA B
R
= 9 for normal speed mode and S
fast
=
-----------------------------------
(
D
(
+
D
1
+
)S
2
)S
+
S
Recommended Max
Recommended Max
Receiver Error (%)
Receiver Error (%)
M
± 3.0
± 2.5
± 2.0
± 2.0
± 1.5
± 1.5
± 2.5
± 2.0
± 1.5
± 1.5
± 1.5
± 1.0
F
= 4 for dou-
M
= 5 for
278