ATMEGA165-16MI Atmel, ATMEGA165-16MI Datasheet - Page 151
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
ATMEGA165-16MI
Manufacturer Part Number
ATMEGA165-16MI
Description
IC AVR MCU 16K 16MHZ 64-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA165-16MI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-MLF®, 64-QFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Double Speed Operation
(U2X)
External Clock
2573G–AVR–07/09
Table 64. Equations for Calculating Baud Rate Register Setting
Note:
Some examples of UBRR values for some system clock frequencies are found in Table
72 (see page 171).
The transfer rate can be doubled by setting the U2X bit in UCSRA. Setting this bit only
has effect for the asynchronous operation. Set this bit to zero when using synchronous
operation.
Setting this bit will reduce the divisor of the baud rate divider from 16 to 8, effectively
doubling the transfer rate for asynchronous communication. Note however that the
Receiver will in this case only use half the number of samples (reduced from 16 to 8) for
data sampling and clock recovery, and therefore a more accurate baud rate setting and
system clock are required when this mode is used. For the Transmitter, there are no
downsides.
External clocking is used by the synchronous slave modes of operation. The description
in this section refers to Figure 70 for details.
External clock input from the XCK pin is sampled by a synchronization register to mini-
mize the chance of meta-stability. The output from the synchronization register must
then pass through an edge detector before it can be used by the Transmitter and
Receiver. This process introduces a two CPU clock period delay and therefore the max-
imum external XCK clock frequency is limited by the following equation:
Note that f
mended to add some margin to avoid possible loss of data due to frequency variations.
Operating Mode
Asynchronous Normal
mode (U2X = 0)
Asynchronous Double
Speed mode (U2X = 1)
Synchronous Master
mode
BAUD Baud rate (in bits per second, bps)
f
UBRR Contents of the UBRRH and UBRRL Registers, (0-4095)
OSC
1. The baud rate is defined to be the transfer rate in bit per second (bps)
System Oscillator clock frequency
osc
depends on the stability of the system clock source. It is therefore recom-
BAUD
BAUD
BAUD
Equation for Calculating
Baud Rate
=
=
=
-------------------------------------- -
16 UBRR
f
---------------------------------- -
8 UBRR
---------------------------------- -
2 UBRR
XCK
(
(
(
f
f
f
<
OSC
OSC
OSC
(1)
f
---------- -
OSC
4
+
+
+
1
1
1
)
)
)
Equation for Calculating
UBRR
ATmega165/V
UBRR
UBRR
UBRR Value
=
=
=
----------------------- - 1
16BAUD
------------------- - 1
8BAUD
------------------- - 1
2BAUD
f
f
f
OSC
OSC
OSC
–
–
–
151
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