AT90SCR100 datasheet(77/433 Pages) ATMEL

tên linh kiện	AT90SCR100

Giải thích chi tiết về linh kiện	8-bit Microcontroller for Smart Card Readers

PDF	433 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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77 / 433 page

TPR0327AY–SMS–30Jan09

AT90SCR100

Notes: 1. When LED control disabled, a current of ~8mA is provided on the port.

12.3.1

LEDCR - LED Control Register

• Bit 7..6, 5..4, 3..2, 1..0 - LEDn [1..0]: LED Port configuration bits

12.4

Ports as General Digital I/O

The ports are bi-directional I/O ports with optional internal pull-ups. Figure 12-4 shows a func-

tional description of one I/O-port pin, here generically called Pxn.

Table 12-1.

LED Configuration

LEDx.1

LEDx.0

Port Latch Data

NMOS

Comments

LED control disabled(1)

LED mode 2 mA

LED mode 4 mA

Bit

765

$000075

LED3 [1..0]

LED2 [1..0]

LED1 [1..0]

LED0 [1..0]

LEDCR

Read/write

RRRRR

Initial value

0x00

Table 13-1 .

LED Port Selection

LEDn1

LEDn0

Description

LED control disabled

2 mA Current Source

4 mA Current Source

Reserved Configuration

For implementation example, please see section “Typical Application” on page

400.

Note

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