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ATTINY2313-20PU Datasheet(PDF) 37 Page - ATMEL Corporation |
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ATTINY2313-20PU Datasheet(HTML) 37 Page - ATMEL Corporation |
37 / 231 page 37 ATtiny2313/V 2543I–AVR–04/06 Notes: 1. Values are guidelines only. Actual values are TBD. 2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling) Power-on Reset A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detec- tion level is defined in Table 15. The POR is activated whenever V CC is below the detection level. The POR circuit can be used to trigger the start-up Reset, as well as to detect a failure in supply voltage. A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reach- ing the Power-on Reset threshold voltage invokes the delay counter, which determines how long the device is kept in RESET after V CC rise. The RESET signal is activated again, without any delay, when V CC decreases below the detection level. Figure 15. MCU Start-up, RESET Tied to V CC Table 15. Reset Characteristics Symbol Parameter Condition Min (1) Typ (1) Max (1) Units VPOT Power-on Reset Threshold Voltage (rising) TA = -40 - 85°C1.2 V Power-on Reset Threshold Voltage (falling)(2) TA = -40 - 85°C1.1 V VRST RESET Pin Threshold Voltage V CC = 1.8 - 5.5V 0.2 V CC 0.9 V CC V tRST Minimum pulse width on RESET Pin VCC = 1.8 - 5.5V 2.5 µs V RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST CC |
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