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AT90SCR100 Datasheet(PDF) 77 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 77 Page - ATMEL Corporation |
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77 / 433 page  77 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 PIN Comments 00 0 1 0 LED control disabled(1) 00 1 0 1 01 0 0 0 LED mode 2 mA 01 1 0 1 10 0 0 0 LED mode 4 mA 10 1 0 1 Bit 765 43 2 1 0 $000075 LED3 [1..0] LED2 [1..0] LED1 [1..0] LED0 [1..0] LEDCR Read/write RRRRR R R R Initial value 0 0 0 0 0 0 0 0 0x00 Table 13-1 . LED Port Selection LEDn1 LEDn0 Description 0 0 LED control disabled 0 1 2 mA Current Source 1 0 4 mA Current Source 1 1 Reserved Configuration For implementation example, please see section “Typical Application” on page 400. Note |
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