AT90S8515 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 active. Port D also serves the functions of various special features of the AT90S8515 as listed on page 73. RESET Reset input. A low level on this pin for more 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. ICP ICP is the input pin for the Timer/Counter1 Input Capture function. OC1B OC1B is the output pin for the Timer/Counter1 Output CompareB function. ALE ALE is the Address Latch Enable used when the External Memory is enabled. The ALE strobe is used to latch the low-order address (8 bits) into an address latch during the first access cycle, and the AD0 -7 pins are used for data during the second access cycle. 5 0841G–09/01
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