ATMEGA32L-8AC Atmel, ATMEGA32L-8AC Datasheet - Page 143
ATMEGA32L-8AC
Manufacturer Part Number
ATMEGA32L-8AC
Description
IC AVR MCU 32K LV 8MHZ COM44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA32L-8AC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA32L-8AC
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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Double Speed
Operation (U2X)
External Clock
Synchronous Clock
Operation
2503Q–AVR–02/11
Table 60. Equations for Calculating Baud Rate Register Setting
Note:
Some examples of UBRR values for some system clock frequencies are found in
page
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
External clock input from the XCK pin is sampled by a synchronization register to minimize 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 maximum external XCK clock frequency is lim-
ited by the following equation:
Note that f
add some margin to avoid possible loss of data due to frequency variations.
When Synchronous mode is used (UMSEL = 1), the XCK pin will be used as either clock input
(Slave) or clock output (Master). The dependency between the clock edges and data sampling
or data change is the same. The basic principle is that data input (on RxD) is sampled at the
opposite XCK clock edge of the edge the data output (TxD) is changed.
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
165).
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 recommended to
Figure 70
for details.
BAUD
BAUD
BAUD
Equation for Calculating
f
XCK
Baud Rate
=
=
=
<
-------------------------------------- -
16 UBRR
---------------------------------- -
8 UBRR
---------------------------------- -
2 UBRR
f
---------- -
(
(
OSC
(
4
f
f
f
OSC
OSC
OSC
(1)
+
+
+
1
1
1
)
)
)
UBRR
UBRR
UBRR
Calculating UBRR
Equation for
ATmega32(L)
=
=
=
Value
----------------------- - 1
16BAUD
------------------- - 1
8BAUD
------------------- - 1
2BAUD
f
f
f
OSC
OSC
OSC
Table 68
–
–
–
(see
143
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