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8XC51R Folha de dados(PDF) 7 Page - Intel Corporation

Nome de Peças 8XC51R
Descrição Electrónicos  CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
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Fabricante Electrônico  INTEL [Intel Corporation]
Página de início  http://www.intel.com
Logo INTEL - Intel Corporation

8XC51R Folha de dados(HTML) 7 Page - Intel Corporation

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8XC51RARBRC
ONCE MODE
The ONCE (‘‘On-Circuit Emulation’’) Mode facilitates
testing
and
debugging
of
systems
using
the
8XC51RX without the 8XC51RX having to be re-
moved from the circuit The ONCE Mode is invoked
by
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 8XC51RX is in this mode an emulator
or test CPU can be used to drive the circuit Normal
operation is restored when a normal reset is applied
8XC51RX 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
standards
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 Cto a70 C With the ex-
tended temperature range option operational char-
acteristics are guaranteed over the range of b40 C
to a85 C
The optional burn-in is dynamic for a minimum time
of 168 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
P
Plastic
Commercial
No
N
PLCC
Commercial
No
S
QFP
Commercial
No
TP
Plastic
Extended
No
TN
PLCC
Extended
No
TS
QFP
Extended
No
LP
Plastic
Extended
Yes
LN
PLCC
Extended
Yes
LS
QFP
Extended
Yes
NOTE
Contact distributor or local sales office to match EXPRESS prefix with proper device
EXAMPLES
P80C51RA indicates 80C51RA in a plastic package and specified for commercial temperature range without burn-in
TS87C51RC indicates 87C51RC in a QFP package and specified for extended temperature range without burn-in
7


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