89C52 datasheet(7/32 Pages) PHILIPS

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Philips Semiconductors

Product specification

89C51/89C52/89C54/89C58

80C51 8-bit microcontroller family

4K/8K/16K/32K Flash

1999 Oct 27

FLASH EPROM MEMORY

General Description

The 89C51/89C52/89C54/89C58 FLASH reliably stores memory

contents even after 100 erase and program cycles. The cell is

designed to optimize the erase and programming mechanisms. In

addition, the combination of advanced tunnel oxide processing and

low internal electric fields for erase and programming operations

produces reliable cycling.

Features

• FLASH EPROM internal program memory with Chip Erase

• Up to 64 k byte external program memory if the internal program

memory is disabled (EA = 0)

• Programmable security bits

• 100 minimum erase/program cycles for each byte

• 10 year minimum data retention

• Programming support available from many popular vendors

OSCILLATOR CHARACTERISTICS

XTAL1 and XTAL2 are the input and output, respectively, of an

inverting amplifier. The pins can be configured for use as an

on-chip oscillator.

To drive the device from an external clock source, XTAL1 should be

driven while XTAL2 is left unconnected. There are no requirements

on the duty cycle of the external clock signal, because the input to

the internal clock circuitry is through a divide-by-two flip-flop.

However, minimum and maximum high and low times specified in

the data sheet must be observed.

RESET

A reset is accomplished by holding the RST pin high for at least two

machine cycles (24 oscillator periods), while the oscillator is running.

To insure a good power-on reset, the RST pin must be high long

enough to allow the oscillator time to start up (normally a few

milliseconds) plus two machine cycles. At power-on, the voltage on

VCC and RST must come up at the same time for a proper start-up.

Ports 1, 2, and 3 will asynchronously be driven to their reset

condition when a voltage above VIH1 (min.) is applied to RESET.

The value on the EA pin is latched when RST is deasserted and has

no further effect.

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