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AT90S8535 Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 127 page ![]() 5 AT90S/LS8535 1041H–11/01 current if the pull-up resistors are activated. Two Port C pins can alternatively be used as oscillator for Timer/Counter2. The Port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port D (PD7..PD0) Port D is an 8-bit bi-directional I/O port with internal pull-up resistors. The Port D output buffers can sink 20 mA. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. Port D also serves the functions of various special features of the AT90S8535 as listed on page 86. The Port D pins are tri-stated when a reset condition becomes active, even if the clock is not running. RESET Reset input. An external reset is generated by a low level on the RESET pin. Reset pulses longer than 50 ns will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset. XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit. XTAL2 Output from the inverting oscillator amplifier. AVCC AVCC is the supply voltage pin for Port A and the A/D Converter. If the ADC is not used, this pin must be connected to VCC. If the ADC is used, this pin must be connected to VCC via a low-pass filter. See page 68 for details on operation of the ADC. AREF AREF is the analog reference input for the A/D Converter. For ADC operations, a volt- age in the range 2V to AVCC must be applied to this pin. AGND Analog ground. If the board has a separate analog ground plane, this pin should be con- nected to this ground plane. Otherwise, connect to GND. |
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