AT90SCR100 datasheet(52/433 Pages) ATMEL

No. de pieza	AT90SCR100

Descripción Electrónicos	8-bit Microcontroller for Smart Card Readers

PDF	433 Pages

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Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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52 / 433 page

TPR0327AY–SMS–30Jan09

AT90SCR100

Figure 9-1.

Reset Logic

Notes: 1. Values are guidelines only. Actual values are TBC.

2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)

9.2.1

Power-on Reset

A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level

is defined in Table 9-1. The POR is activated whenever VCC 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.

Table 9-1.

Reset Characteristics(1)

Symbol

Parameter

Condition

Min

Typ

Max

Units

VPOT

Power-on Reset Threshold

Voltage (rising)

1.4

1.8

Power-on Reset Threshold

Voltage (falling)(2)

1.3

1.8

VRST

RESET Pin ViL

0.2VCC

RESET Pin ViH

0.85VCC

tRST

Minimum pulse width on

RESET Pin

1.5

μs

MCU Status

Brown-out

Reset Circuit

BODLEVEL

Delay Counters

TIMEOUT

DATA BUS

Clock

Controller

SPIKE

FILTER

Pull-up Resistor

JTAG Reset

Watchdog

Oscillator

SUT[1:0]

Power-on Reset

Circuit

AT90SCR100 Datasheet(PDF) 52 Page - ATMEL Corporation

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