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參數(shù)資料
| 型號： | TS80C51BHP-2 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數(shù)： | 19/21頁 |
| 文件大?。?/td> | 2233K |
| 代理商： | TS80C51BHP-2 |
87C51/80C51BH/80C31BH
ONCE MODE
The ONCE (``On-CircuitEmulation'') mode facilitates
testing and debugging of systems using the
87C51/BH without the 87C51/BH 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 87C51/BH 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.
87C51/BH 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
°C to 70°C. With the extend-
ed temperature range option, operational character-
istics are guaranteed over the range of -40°C to
+
85°C.
The optional burn-in is dynamic for a minimum time
of 160 hours at 125
°C with VCC = 6.9V ± 0.25V,
following guidelines in MIL-STD-883, Method 1015.
Package types and EXPRESSversions 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
D
Cerdip
Commercial
No
N
PLCC
Commercial
No
S
QFP
Commercial
No
TP
Plastic
Extended
No
TD
Cerdip
Extended
No
TN
PLCC
Extended
No
TS
QFP
Extended
No
LP
Plastic
Extended
Yes
LD
Cerdip
Extended
Yes
LN
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-
in.
7
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