PCIF0 datasheet(62/294 Pages) ATMEL

Il numero della parte	PCIF0

Spiegazioni elettronici	High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture

PDF	294 Pages

Scroll/Zoom	100%

Produttore elettronici	ATMEL [ATMEL Corporation]

Homepage	http://www.atmel.com

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9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

• Bit 3 - WDE: Watchdog System Reset Enable

WDE is overridden by WDRF in MCUSR. This means that WDE is always set when WDRF is

set. To clear WDE, WDRF must be cleared first. This feature ensures multiple resets during

conditions causing failure, and a safe start-up after the failure.

• Bit 5, 2..0 - WDP3..0: Watchdog Timer Prescaler 3, 2, 1 and 0

The WDP3..0 bits determine the Watchdog Timer prescaling when the Watchdog Timer is run-

ning. The different prescaling values and their corresponding time-out periods are shown in

Table 6-2 on page 62.

Table 6-2.

Watchdog Timer Prescale Select

WDP3

WDP2

WDP1

WDP0

Number of

WDT Oscillator Cycles

Typical Time-out

at V

CC = 5.0V

2K (2048) cycles

16ms

4K (4096) cycles

32ms

8K (8192) cycles

64ms

16K (16384) cycles

0.125s

32K (32768) cycles

0.25s

64K (65536) cycles

0.5s

128K (131072) cycles

1.0s

256K (262144) cycles

2.0s

512K (524288) cycles

4.0s

1024K (1048576) cycles

8.0s

Reserved

PCIF0 Scheda tecnica(PDF) 62 Page - ATMEL Corporation

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