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ATtiny4-TSHR bảng dữ liệu(PDF) 30 Page - ATMEL Corporation

tên linh kiện ATtiny4-TSHR
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 512/1024 Bytes In-System Programmable Flash
PDF  168 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATtiny4-TSHR bảng dữ liệu(HTML) 30 Page - ATMEL Corporation

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8127C–AVR–10/09
ATtiny4/5/9/10
Figure 8-5.
Watchdog Reset During Operation
8.3
Watchdog Timer
The Watchdog Timer is clocked from an on-chip oscillator, which runs at 128 kHz. See Figure 8-
6. By controlling the Watchdog Timer prescaler, the Watchdog Reset interval can be adjusted as
shown in Table 8-2 on page 32. The WDR – Watchdog Reset – instruction resets the Watchdog
Timer. The Watchdog Timer is also reset when it is disabled and when a device reset occurs.
Ten different clock cycle periods can be selected to determine the reset period. If the reset
period expires without another Watchdog Reset, the ATtiny4/5/9/10 resets and executes from
the Reset Vector. For timing details on the Watchdog Reset, refer to Table 8-3 on page 33.
Figure 8-6.
Watchdog Timer
The Wathdog Timer can also be configured to generate an interrupt instead of a reset. This can
be very helpful when using the Watchdog to wake-up from Power-down.
To prevent unintentional disabling of the Watchdog or unintentional change of time-out period,
two different safety levels are selected by the fuse WDTON as shown in Table 8-1 on page 31.
See “Procedure for Changing the Watchdog Timer Configuration” on page 31 for details.
CK
CC
MCU RESET
WATCHDOG
PRESCALER
128 kHz
OSCILLATOR
WATCHDOG
RESET
WDP0
WDP1
WDP2
WDP3
WDE
MUX



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