ATtiny167-ESSZ datasheet(58/282 Pages) ATMEL

Part #	ATtiny167-ESSZ

Description	8-bit Microcontroller with 8K/16K Bytes In-System Programmable Flash and LIN Controller

PDF	282 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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58 / 282 page

7728D–AVR–07/09

ATtiny87/ATtiny167

• 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 58.

Table 6-2.

Watchdog Timer Prescale Select

WDP3

WDP2

WDP1

WDP0

Number of

WDT Oscillator Cycles

Typical Time-out

at Vcc = 5.0V

2K (2048) cycles

16 ms

4K (4096) cycles

32 ms

8K (8192) cycles

64 ms

16K (16384) cycles

0.125 s

32K (32768) cycles

0.25 s

64K (65536) cycles

0.5 s

128K (131072) cycles

1.0 s

256K (262144) cycles

2.0 s

512K (524288) cycles

4.0 s

1024K (1048576) cycles

8.0 s

Reserved

ATtiny167-ESSZ Datasheet(PDF) 58 Page - ATMEL Corporation

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