s
mu @
MCS@51
8-BIT CONTROL-ORIENTED MICROCONTROLLERS
Commercial/Express
8031AH18051AH18051AHP
8032N+18052N-I
8751W8751H-8
8751BW8752BI-I
s
High Performance HMOS Process
s
Internal Timers/Event Counters
s
2-Level interrupt Priority Structure
s
32 1/0 Lines (Four 8-Bit Ports)
s
64K External Program Memory Space
s
Security Feature Protects EPROM Parts
s
Boolean Processor
s
Bit-Addressable RAM
s
Programmable Full Duplex Serial
Channel
s
111 Instructions
(64
Single-Cycle)
s
s
Extended Temperature Range
64K External Data Memory Space
(–40”C to +85”C)
Against Software Piracy
The MCS@51 controllers are optimized for control applications. Byte-processing and numerical operations on
small data structures are facilitated by a variety of fast addressing modes for accessing the internal RAM. The
instruction set provides a convenient menu of 8-bit arithmetic instructions, including multiply and divide instruc-
tions. Extensive on-chip support is provided for one-bit variables as a separate data type, allowing direct bit
manipulation and testing in control and logic systems that require Boolean processing.
The 8751H is an EPROM version of the 8051AH. It has 4 Kbytes of electrically programmable ROM which can
be erased with ultraviolet light. His fully compatible with the 8051AH but incorporates one additional feature: a
Program Memory Security bit that can be used to protect the EPROM against unauthorized readout. The
8751 H-8 is identical to the 8751 H but only operates up to 8 MHz.
The 8051AHP is identical to the 8051AH with the exception of the Protection Feature. To incorporate this
Protection Feature, program verification has been disabled and external memory accesses have been limited
to 4K.
The 8052AH is an enhanced version of the 8051AH. It is backwards compatible with the 8051AH and is
fabricated with HMOS II technology. The 8052AH enhancements are listed in the table below. Also refer to this
table for the ROM, ROMless and-EPROM versions of each product.
Device
8031AH
8051AH
6051AHP
8751 H
8751 H-8
6751 BH
8032AH
6052AH
8752BH
Intsrnal Memory
Program
none
4K
X
8 ROM
4K
X
6 ROM
4K
X
8 EPROM
4K
X
8 EPROM
4K
X
8 EPROM
none
8K
X
8 ROM
8K
X
8 EPROM
Data
128
X
8 RAM
128
X
8 RAM
128
X
8 RAM
128
X
8 RAM
128
X
6 RAM
128
X
8 RAM
256
X
6 RAM
256
X
8 RAM
256
X
8 RAM
Timera/
Event Counters
2 x 18-Bit
2 x 16-Bit
2 x 16-Bit
2 x 16-Bit
2 x 16-Bit
2 x 16-Bit
3 x 16-Bit
3 x 16-Bit
3 x 16-Bit
Interrupts
5
5
5
5
5
5
6
6
6
I
Intel Corporationassumes no responsibility the use of any circuit~ other than circuitryembodied in an Intel product.No other circuitpatent
for
licenses are implied.Informationcontained herein supersedes previouslypublishedspecificationson theaa davices from Intel.
O INTEL CORPORATION, 1994
October 1994
Order Numben 272318-002
INTEL [ INTEL CORPORATION ]
