ATMEGA644PV-10MQ Atmel, ATMEGA644PV-10MQ Datasheet - Page 186
![MCU AVR 64K FLASH 10MHZ 44-QFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA644PV-10MQ
Manufacturer Part Number
ATMEGA644PV-10MQ
Description
MCU AVR 64K FLASH 10MHZ 44-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PV-10MQ
Core Processor
AVR
Core Size
8-Bit
Speed
10MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN Exposed Pad
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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16.9.3
8011O–AVR–07/10
Asynchronous Operational Range
Figure 16-7. 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
delayed to (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 16-2 on page
frames to the start 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 16-2 on page 187
that can be tolerated. Note that Normal Speed mode has higher toleration of baud rate
variations.
F
M
slow
(U2X = 0)
(U2X = 1)
Sample
Sample
RxD
R
slow
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.
=
M
= 5 for Double Speed mode.
------------------------------------------ -
S 1
Figure 16-7 on page
–
187) base frequency, the Receiver will not be able to synchronize the
(
D
+
1
1
and
+
D S ⋅
1
2
)S
Table 16-3 on page 187
+
3
2
S
F
4
fast
5
3
is the ratio of the fastest incoming data rate that can be
186. For Double Speed mode the first low level must be
6
7
4
8
ATmega164P/324P/644P
STOP 1
9
5
list the maximum receiver baud rate error
10
R
fast
(A)
0/1
6
=
0/1
F
-----------------------------------
(
= 8 for normal speed and S
D
M
(B)
0/1
0/1
(
+
= 9 for normal speed and
D
1
+
)S
2
)S
+
S
M
(C)
F
186
= 4
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