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| 型號(hào)： | MC80C52CXXX-16 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁(yè)數(shù)： | 25/46頁(yè) |
| 文件大小： | 4720K |
| 代理商： | MC80C52CXXX-16 |
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30
ATtiny20 [DATASHEET]
8235E–AVR–03/2013
Figure 8-4.
External Reset During Operation
8.2.3
Watchdog Reset
When the Watchdog times out, it will generate a short reset pulse. On the falling edge of this pulse, the delay timer starts
counting the time-out period tTOUT. See page 30 for details on operation of the Watchdog Timer and Table 20-4 on page
170 for details on reset time-out.
Figure 8-5.
Watchdog Reset During Operation
8.2.4
Brown-out Detection
ATtiny20 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 8-6 on page 31), the
Brown-out Reset is immediately activated. When VCC increases above the trigger level (VBOT+ in Figure 8-6), the delay
counter starts the MCU after the Time-out period tTOUT has expired.
CC
CK
CC
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