AT90SCR100 datasheet(76/433 Pages) ATMEL

No. de pieza	AT90SCR100

Descripción Electrónicos	8-bit Microcontroller for Smart Card Readers

PDF	433 Pages

Scroll/Zoom	100%

Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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76 / 433 page

TPR0327AY–SMS–30Jan09

AT90SCR100

12.2

Specific Low Speed Keyboard Output

To avoid abusive EMC generation, AT90SCR100 embeds specific Low Speed Output Pads.

Figure 12-2.

Low-speed Output Schematic

The current limitation of the CTRL block requires a polarisation current of about 250μA. This

block is automatically disabled in power-down, power-save, standby and extended standby

modes.

These pads only concern KBOn pins located on port PE [0..7]. See “Pin List Configuration” on

page 5.

12.3

LED

AT90SCR100 supports specific ports driving current to allow easy control of LED displays.

Figure 12-3.

LED Source Current

Power Management Control

SMCR + CPU status

Port Latch

Data

KBOn

CTRL

NMOS

Weak

1. When switching a low level, LEDCR device has a permanent current of

about N mA/15 (N is 2 or 4)

2. The port must be configured and driven as standard IO port.

Port Latch

Data

LEDn.0

LEDn.1

LEDCR

NMOS

Note

AT90SCR100 Datasheet(PDF) 76 Page - ATMEL Corporation