ATMEGA8U2-AU Atmel, ATMEGA8U2-AU Datasheet - Page 58
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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Table 10-3.
7799D–AVR–11/10
WDP3
0
0
0
0
0
0
0
0
1
1
WDP2
Watchdog Timer Prescale Select, DIV = 0 (CLKwdt = CLK128 / 1)
0
0
0
0
1
1
1
1
0
0
WDP1
0
0
1
1
0
0
1
1
0
0
• Bit 3 - WDEWIF: Watchdog Early Warning Interrupt Flag
This bit is set when a first time-out occurs in the Watchdog Timer and if the WDEWIE bit is
enabled. WDEWIF is automatically cleared by hardware when executing the corresponding
interrupt handling vector. Alternatively, WDIF can be cleared by writing a logic one to the flag.
When the I-bit in SREG and WDEWIE are set, the Watchdog Time-out Interrupt is executed.
• Bit 2 - WDEWIE: Watchdog Early Warning Interrupt Enable
When this bit has been set by software, an interrupt will be generated on the watchdog interrupt
vector when the Early warning flag is set to one by hardware.
• Bit 1:0 - WCLKD[1:0]: Watchdog Timer Clock Divider
Table 10-2.
WCLKD2
WDP0
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
0
1
Watchdog Timer Clock Divider Configuration
Number of WDT Oscillator
Cycles before 1st time-out
1024K (1048576) cycles
128K (131072) cycles
256K (262144) cycles
512K (524288) cycles
16K (16384) cycles
32K (32768) cycles
64K (65536) cycles
2K (2048) cycles
4K (4096) cycles
8K (8192) cycles
(Early warning)
WCLKD1
0
0
1
1
0
0
1
1
WCLKD0
0
1
0
1
0
1
0
1
Early warning Typical
ATmega8U2/16U2/32U2
Time-out at
V
CC
0.125 s
16 ms
32 ms
64 ms
0.25 s
0.5 s
1.0 s
2.0 s
4.0 s
8.0 s
Mode
Clk
Clk
Clk
Clk
Clk
Clk
Clk
Clk
= 5.0V
WDT
WDT
WDT
WDT
WDT
WDT
WDT
WDT
= Clk
= Clk
= Clk
= Clk
= Clk
= Clk
= Clk
= Clk
128k
128k
128k
128k
128k
128k
128k
128k
Reset/Interrupt Typical
/ 3
/ 5
/ 7
/ 9
/ 11
/ 13
/ 15
Time-out at
V
Watchdog
CC
128 ms
0.250 s
32 ms
64 ms
16.0 s
0.5 s
1.0 s
2.0 s
4.0 s
8.0 s
= 5.0V
58
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