參數(shù)資料
型號： MQ83C154DCXXX-25P883D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44
封裝： CERAMIC, QFP-44
文件頁數(shù)： 107/176頁
文件大小： 2962K
代理商： MQ83C154DCXXX-25P883D
36
2535J–AVR–08/10
ATtiny13
8.1.2
External Reset
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer
than the minimum pulse width (See “System and Reset Characteristics” on page 119.) will gen-
erate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a
reset. When the applied signal reaches the Reset Threshold Voltage – VRST – on its positive
edge, the delay counter starts the MCU after the Time-out period – tTOUT – has expired.
Figure 8-4.
External Reset During Operation
8.1.3
Brown-out Detection
ATtiny13 has an On-chip Brown-out Detection (BOD) circuit for monitoring the VCC level during
operation by comparing it to a fixed trigger level. The trigger level for the BOD can be selected
by the BODLEVEL fuses. The trigger level has a hysteresis to ensure spike free Brown-out
Detection. The hysteresis on the detection level should be interpreted as VBOT+ = VBOT + VHYST/2
and VBOT- = VBOT - VHYST/2.
When the BOD is enabled, and VCC decreases to a value below the trigger level (VBOT- in Figure
8-5 on page 36), the Brown-out Reset is immediately activated. When VCC increases above the
trigger level (VBOT+ in Figure 8-5 on page 36), the delay counter starts the MCU after the Time-
out period tTOUT has expired.
The BOD circuit will only detect a drop in VCC if the voltage stays below the trigger level for lon-
Figure 8-5.
Brown-out Reset During Operation
CC
VCC
RESET
TIME-OUT
INTERNAL
RESET
VBOT-
VBOT+
tTOUT
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