Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 38)

100

101

ATmega169V/L

2514A–AVR–08/02

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 16. The POR is activated whenever V

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

rise. The RESET signal is activated

again, without any delay, when V

decreases below the detection level.

Figure 15. MCU Start-up, RESET

Tied to V

Figure 16. MCU Start-up, RESET Extended Externally

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 38

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