AT90S8515 データシートの表示（PDF） - Atmel Corporation

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AT90S8515

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

RESET

XTAL1

XTAL2

ICP

OC1B

ALE

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 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.

Input to the inverting oscillator amplifier and input to the internal clock operating circuit.

Output from the inverting oscillator amplifier.

ICP is the input pin for the Timer/Counter1 Input Capture function.

OC1B is the output pin for the Timer/Counter1 Output CompareB function.

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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