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STK505 Folha de dados(PDF) 5 Page - ATMEL Corporation |
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STK505 Folha de dados(HTML) 5 Page - ATMEL Corporation |
5 / 11 page 5 Clock Sources and Reset The Clock Switch The STK505 has support to easily configure the hardware to support three different clock configurations • External Clock • On board crystal • Internal Oscillator The XTAL1 and XTAL2 pins are configured as regular I/O port pins when not used as clock input/output. The clock selection switch is used to connect the pins to different components dependant on whether it is used as clock pins or I/O pins. Note: The device fuses must be programmed to use the selected clock source. See the device datasheet for more details. Position Function XTAL XTAL1 and XTAL2 pins connected to the XTAL socket EXT CLK XTAL1 pin connected to the STK500 clock source XTAL2 pin connected to PORTB header INT RC XTAL1 and XTAL2 pins connected to the PORTB header The Reset/PORTB Switch The RESET/PORTB switch connects the reset pin to either the reset signal from STK500, or to the PORTB header on STK500 to make it accessible for use as a regular I/O pin. Note: The RSTDISBL fuse must be programmed to disable reset functionality and use the pin as a regular I/O port pin. Se the device datasheet for further details. |
Nº de peça semelhante - STK505 |
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Descrição semelhante - STK505 |
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