5962-0051801Q9A 查看數據表（PDF） - Atmel Corporation

零件编号

产品描述 (功能)

生产厂家

5962-0051801Q9A

Rad. Tolerant 8-bit ROMless Microcontroller

Atmel Corporation 

Mnemonic

ALE

PSEN

EA

XTAL1

XTAL2

Type Name and Function

O (I)

Address Latch Enable: Output pulse for latching the low byte of the

address during an access to external memory. In normal operation, ALE

is emitted at a constant rate of 1/6 the oscillator frequency, and can be

used for external timing or clocking. Note that one ALE pulse is skipped

during each access to external data memory.

Program Store ENable: The read strobe to external program memory.

When executing code from the external program memory, PSEN is

O activated twice each machine cycle, except that two PSEN activations

are skipped during each access to external data memory. PSEN is not

activated during fetches from internal program memory.

I

External Access Enable: EA must be externally held low to enable the

device to fetch code from external program memory locations.

I

Crystal 1: Input to the inverting oscillator amplifier and input to the

internal clock generator circuits.

O Crystal 2: Output from the inverting oscillator amplifier

4 80C32E

4149M–AERO–06/04

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