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參數(shù)資料
| 型號(hào)： | IR80C52XXX-12:R |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁(yè)數(shù)： | 9/81頁(yè) |
| 文件大小： | 663K |
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17
ATtiny28L/V
1062F–AVR–07/06
activated again, without any delay, when the V
CC decreases below detection level. See
If the built-in start-up delay is sufficient, RESET can be connected to VCC directly or via
an external pull-up resistor. By holding the RESET pin low for a period after V
CC has
been applied, the Power-on Reset period can be extended. Refer to Figure 18 for a tim-
ing example of this.
Figure 17. MCU Start-up, RESET Tied to VCC.
Figure 18. MCU Start-up, RESET Controlled Externally
External Reset
An external reset is generated by a low level on the RESET pin. Reset pulses longer
than 50 ns will generate a reset, even if the clock is not running. Shorter pulses are not
guaranteed to generate a reset. When the applied voltage reaches the Reset Threshold
Voltage (V
RST) on its positive edge, the delay timer starts the MCU after the Time-out
period (t
TOUT) has expired.
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
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