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AT90SCR100 bảng dữ liệu(PDF) 76 Page - ATMEL Corporation

tên linh kiện AT90SCR100
Giải thích chi tiết về linh kiện  8-bit Microcontroller for Smart Card Readers
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT90SCR100 bảng dữ liệu(HTML) 76 Page - ATMEL Corporation

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76
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
N
Power Management Control
SMCR + CPU status
Port Latch
Data
KBOn
CTRL
N
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.
N
Port Latch
Data
LEDn.0
LEDn.1
Pin
LEDCR
N
NMOS
Note



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