ATmega16U4 datasheet(52/408 Pages) ATMEL

Numer części	ATmega16U4

Szczegółowy opis	8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller

PDF	408 Pages

Scroll/Zoom	100%

Producent	ATMEL [ATMEL Corporation]

Strona internetowa	http://www.atmel.com

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52 / 408 page

7766D–AVR–01/09

ATmega16U4/ATmega32U4

8.0.6

Watchdog Reset

When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On

the falling edge of this pulse, the delay timer starts counting the Time-out period t

TOUT. Refer to

page 54 for details on operation of the Watchdog Timer.

Figure 8-6.

Watchdog Reset During Operation

8.0.7

USB Reset

When the USB controller is enabled and configured with the USB Reset CPU feature enabled

and if a valid USB Reset signalling is detected on the bus, the CPU core is reset but the USB

controller remains enabled and attached. This feature may be used to enhance device reliability.

Figure 8-7.

USB Reset During Operation

8.0.8

MCU Status Register – MCUSR

The MCU Status Register provides information on which reset source caused an MCU reset.

• Bit 7..6 - Reserved

These bits are reserved and should be read as 0. Do not set these bits.

USB Traffic

USBRSTMIN

End of Reset

Bit

765

210

–

USBRF

JTRF

WDRF

BORF

EXTRF

PORF

MCUSR

Read/Write

R/W

Initial Value

See Bit Description

ATmega16U4 Arkusz danych(PDF) 52 Page - ATMEL Corporation