Rainbow-electronics ATtiny2313 Manuel d'utilisateur télécharger pdf (Page 35)

ATtiny2313

2543A–AVR–08/03

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 V

POT

(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

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

Table 15. Reset Characteristics

(1)

Symbol Parameter Condition Min Typ Max Units

POT

Power-on Reset

Threshold Voltage

(rising)

= -40 - 85°C1.2 V

Power-on Reset

Threshold Voltage

(falling)

(2)

= -40 - 85°C1.1 V

RST

RESET Pin Threshold

Voltage

= 3V 0.2 V

0.85 V

RST

Minimum pulse width on

RESET Pin

= 3V 900 ns

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 210 211

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Rainbow-electronics ATtiny2313 Manuel d'utilisateur Page 35

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