ATMEGA16U2-AU Atmel, ATMEGA16U2-AU Datasheet - Page 52
ATMEGA16U2-AU
Manufacturer Part Number
ATMEGA16U2-AU
Description
MCU AVR 16K FLASH USB 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA16U2-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
16KB (8K 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
ATMEGA16x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
1.25 KB
Interface Type
SPI, UART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
22
Number Of Timers
2
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
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
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Manufacturer
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7799D–AVR–11/10
when the counter reaches a given time-out value. The WDT gives an interrupt or a system reset
when the counter reaches two times the given time-out value. In normal operation mode, it is
required that the system uses the WDR - Watchdog Timer Reset - instruction to restart the coun-
ter before the time-out value is reached. If the system doesn't restart the counter, an interrupt or
system reset will be issued.
Figure 10-8. Watchdog Timer
In Interrupt mode, the WDT gives an interrupt when the timer expires two times. This interrupt
can be used to wake the device from sleep-modes, and also as a general system timer. One
example is to limit the maximum time allowed for certain operations, giving an interrupt when the
operation has run longer than expected.
In System Reset mode, the WDT gives a reset when the timer expires two times. This is typically
used to prevent system hang-up in case of runaway code.
The third mode, Interrupt and System Reset mode, combines the other two modes by first giving
an interrupt and then switch to System Reset mode. This mode will for instance allow a safe
shutdown by saving critical parameters before a system reset.
In addition to these modes, the early warning interrupt can be enabled in order to generate an
interrupt when the WDT counter expires the first time.
The Watchdog always on (WDTON) fuse, if programmed, will force the Watchdog Timer to Sys-
tem Reset mode. With the fuse programmed the System Reset mode bit (WDE) and Interrupt
mode bit (WDIE) are locked to 1 and 0 respectively. To further ensure program security, altera-
tions to the Watchdog set-up must follow timed sequences. The sequence for clearing WDE or
changing time-out configuration is as follows:
1. In the same operation, write a logic one to the Watchdog change enable bits WDCE
2. Within the next four clock cycles, write the WDE and Watchdog prescaler bits (WDP) as
and WDE. A logic one must be written to WDE regardless of the previous value of the
WDE bit and even if it will be cleared after the operation.
desired, but with the WDCE bit cleared. This must be done in one operation.
OSCILLATOR
CLOCK
DIVIDER
128kHz
WATCHDOG
RESET
OSC/1
OSC/3
OSC/5
OSC/7
WDEWIE
WDIE
WDIF
WDE
ATmega8U2/16U2/32U2
WDP0
WDP1
WDP2
WDP3
MCU RESET
INTERRUPT
EARLY WARNING
INTERRUPT
52
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