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ATmega128 Scheda tecnica(PDF) 14 Page - ATMEL Corporation |
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ATmega128 Scheda tecnica(HTML) 14 Page - ATMEL Corporation |
14 / 61 page Hardware Description 3-4 AVR STK500 User Guide 1925C–AVR–3/03 Figure 3-6. Pinout of PORTE Header The special functions of this port are: n PE0 - PE2: n REF: Analog reference voltage. This pin is connected to the AREF pin on devices having a separate analog reference pin. n XT1: XTAL 1 pin. The internal main clock signal to all sockets. If the XTAL1 jumper is disconnected, this pin can be used as external clock signal. n XT2: XTAL 2 pin. If the XTAL1 jumper is disconnected, this pin can be used for external crystal with the XT1 pin. The headers for the LEDs and switches use the same pinout as the I/O port headers. The pinout of the switch header is explained in Figure 3-7 and the pinout for the LED header is explained in Figure 3-8. The square marking indicates pin 1. Figure 3-7. Pinout of the Switch Header Figure 3-8. Pinout of the LED Header Table 3-1. PORTE Connection ATmega161 AT90S4414/AT90S8515 PE0 PE0/ICP/INT2 ICP PE1 PE1/ALE ALE PE2 PE2/OC1B OC1B PE1 RST GND XT2 VTG PE0 PE2 REF XT1 GND 1 2 PORTE/AUX SW1 SW3 SW5 SW7 VTG SW0 SW2 SW4 SW6 GND 1 2 SWITCHES LED1 LED3 LED5 LED7 VTG LED0 LED2 LED4 LED6 GND 1 2 LEDS |
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