P87C511 datasheet(7/21 Pages) INTEL

7 / 21 page

87C5180C51BH80C31BH

ONCE MODE

The ONCE (‘‘On-Circuit Emulation’’) mode facilitates

testing

and

debugging

systems

using

the

87C51BH without the 87C51BH having to be re-

moved from the circuit The ONCE mode is invoked

1 Pull ALE low while the device is in reset and

PSEN is high

2 Hold ALE low as RST is deactivated

While the device is in ONCE mode the Port 0 pins

float and the other port pins and ALE and PSEN are

weakly pulled high The oscillator circuit remains ac-

tive While the 87C51BH is in this mode an emula-

tor or test CPU can be used to drive the circuit Nor-

mal operation is restored when a normal reset is ap-

plied

87C51BH EXPRESS

The Intel EXPRESS system offers enhancements to

the operational specifications of the MCS-51 family

of microcontrollers These EXPRESS products are

designed to meet the needs of those applications

whose operating requirements exceed commercial

temperature

The EXPRESS program includes the commercial

standard temperature range with burn-in and an ex-

tended temperature range with or without burn-in

With the commercial standard temperature range

operational characteristics are guaranteed over the

temperature range of 0 Cto70 C With the extend-

ed temperature range option operational character-

istics are guaranteed over the range of b40 Cto

85 C

The optional burn-in is dynamic for a minimum time

of 160 hours at 125 C with VCC e 69V g025V

following guidelines in MIL-STD-883 Method 1015

Package types and EXPRESS versions are identified

by a one- or two-letter prefix to the part number The

prefixes are listed in Table 3

For the extended temperature range option this

data sheet specifies the parameters which deviate

from their commercial temperature range limits

Table 3 Prefix Identification

Prefix

Package

Temperature

Burn-in

Type

Range

Plastic

Commercial

Cerdip

Commercial

PLCC

Commercial

QFP

Commercial

Plastic

Extended

Cerdip

Extended

PLCC

Extended

QFP

Extended

Plastic

Extended

Yes

Cerdip

Extended

Yes

PLCC

Extended

Yes

NOTE

Contact distributor or local sales office to match EXPRESS

prefix to proper device

Examples

P87C51 indicates 87C51 in a plastic package and

specified for commercial temperature range without

burn-in

LD87C51 indicates 87C51 in a cerdip package and

specified for extended temperature range with burn-

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