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ATTINY88 Datasheet(PDF) 4 Page - ATMEL Corporation |
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ATTINY88 Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 246 page 4 9157B–AVR–01/10 ATtiny88 Automotive 1.2.7 Port D (PD7:0) Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The PD7..4 output buffers have symmetrical drive characteristics with both high sink and source capabilities, while the PD3..0 output buffers have stronger sink capabilities. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset condition becomes active, even if the clock is not running. The various special features of Port D are elaborated in “Alternate Functions of Port D” on page 71. 1.2.8 AV CC AV CC is the supply voltage pin for the A/D converter and a selection of I/O pins. This pin should be externally connected to V CC even if the ADC is not used. If the ADC is used, it is recom- mended this pin is connected to V CC through a low-pass filter, as described in “Analog Noise Canceling Techniques” on page 172. The following pins receive their supply voltage from AV CC: PC7, PC5:0 and (in 32-lead pack- ages) PA1:0. All other I/O pins take their supply voltage from V CC. |
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