ATMEGA8U2-AU Atmel, ATMEGA8U2-AU Datasheet - Page 53
![MCU AVR 8K FLASH 16MHZ 32TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
ATMEGA8U2-AU
Manufacturer Part Number
ATMEGA8U2-AU
Description
MCU AVR 8K FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8U2-AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
SPI, USART, USB
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
22
Number Of Timers
2
Operating Supply Voltage
5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, AT90USBKEY, ATEVK525
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8U2-AU
Manufacturer:
Atmel
Quantity:
2 772
Part Number:
ATMEGA8U2-AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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- Download datasheet (6Mb)
7799D–AVR–11/10
While the WDT prescaler allows only even division factors (2, 4, 8...), the WDT peripheral also
includes a clock divider that directly acts on the clock source. This divider handles odd division
factors (3, 5, 7). In combination with the prescaler, a large number of time-out values can be
obtained.
The divider factor change is also ruled by the secure timed sequence : first the WDE and WDCE
bits must be set, and then four cycles are available to load the new divider value into the
WDTCKD register. Be aware that after this operation WDE will still be set. So keep in mind the
importance of order of operations. When setting up the WDT in Interrupt mode with specific val-
ues of prescaler and divider, the divider register must be loaded before the prescaler register :
The following code example shows one assembly and one C function for turning off the Watch-
dog Timer. The example assumes that interrupts are controlled (e.g. by disabling interrupts
globally) so that no interrupts will occur during the execution of these functions.
1. Set WDCE and WDE
2. Load the divider factor into WDTCKD
3. Wait WDCE being automatically cleared (just wait 2 more cycles)
4. Set again WDCE and WDE
5. Clear WDE, set WDIE and load the prescaler factor into WDTCSR in a same operation
6. Now the system is properly configured for Interrupt only mode. Inverting the two opera-
tions would have been resulted into “Reset and Interrupt mode” and needed a third
operation to clear WDE.
ATmega8U2/16U2/32U2
53
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