ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 163
ATmega32U2
Manufacturer Part Number
ATmega32U2
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U2
Flash (kbytes)
32 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
22
Ext Interrupts
20
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
5
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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18.8.3
7799D–AVR–11/10
Asynchronous Operational Range
R
slow
=
Figure 18-7. Stop Bit Sampling and Next Start Bit Sampling
The same majority voting is done to the stop bit as done for the other bits in the frame. If the stop
bit is registered to have a logic 0 value, the Frame Error (FEn) Flag will be set.
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
(B). (C) marks a stop bit of full length. 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 the Transmitter is sending frames at too fast or too
slow bit rates, or the internally generated baud rate of the Receiver does not have a similar (see
Table
bit.
The following equations can be used to calculate the ratio of the incoming data rate and internal
receiver baud rate.
D
S
S
S
R
Table 18-2
that Normal Speed mode has higher toleration of baud rate variations.
------------------------------------------ -
S 1
F
M
slow
–
(
D
+
18-2) base frequency, the Receiver will not be able to synchronize the frames to the start
(U2X = 0)
(U2X = 1)
Sample
Sample
+
D S ⋅
RxD
1
)S
and
+
S
Sum of character size and parity size (D = 5 to 10 bit)
Samples per bit. S = 16 for Normal Speed mode and S = 8 for Double Speed
mode.
First sample number used for majority voting. S
for Double Speed mode.
Middle sample number used for majority voting. S
S
is the ratio of the slowest incoming data rate that can be accepted in relation to the
receiver baud rate. R
accepted in relation to the receiver baud rate.
F
M
Table 18-3
= 5 for Double Speed mode.
Figure
1
1
2
18-7. For Double Speed mode the first low level must be delayed to
list the maximum receiver baud rate error that can be tolerated. Note
3
2
4
fast
5
3
is the ratio of the fastest incoming data rate that can be
6
7
4
8
STOP 1
ATmega8U2/16U2/32U2
9
5
R
10
fast
(A)
0/1
6
=
0/1
F
-----------------------------------
(
D
= 8 for normal speed and S
M
(
(B)
0/1
0/1
+
D
= 9 for normal speed and
1
+
)S
2
)S
+
S
M
(C)
F
163
= 4
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