AT90USB646 datasheet(61/459 Pages) ATMEL

tên linh kiện	AT90USB646

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

PDF	459 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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7593H–AVR–11/08

ATmega32U6/AT90USB64/128

Figure 8-5.

Brown-out Reset During Operation

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 63 for details on operation of the Watchdog Timer.

Figure 8-6.

Watchdog Reset During Operation

8.0.7

MCU Status Register – MCUSR

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

• Bit 4 – JTRF: JTAG Reset Flag

This bit is set if a reset is being caused by a logic one in the JTAG Reset Register selected by

the JTAG instruction AVR_RESET. This bit is reset by a Power-on Reset, or by writing a logic

zero to the flag.

• Bit 3 – WDRF: Watchdog Reset Flag

This bit is set if a Watchdog Reset occurs. The bit is reset by a Power-on Reset, or by writing a

logic zero to the flag.

• Bit 2 – BORF: Brown-out Reset Flag

VCC

RESET

TIME-OUT

INTERNAL

RESET

VBOT-

VBOT+

tTOUT

Bit

76543

210

–

JTRF

WDRF

BORF

EXTRF

PORF

MCUSR

Read/Write

RRRR/W

R/W

Initial Value

000See Bit Description

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