■
mu @
MCS@51
8-BIT CONTROL-ORIENTED MICROCONTROLLERS
Commercial/Express
8031AH18051AH18051AHP
8032N+18052N-I
8751W8751H-8
8751BW8752BI-I
■ High Performance HMOS Process ■
■
Internal Timers/Event Counters ■
■
2-Level interrupt Priority Structure
■
■
32 1/0 Lines (Four 8-Bit Ports)
■ 64K External Program Memory Space
■
■
Security Feature Protects EPROM Parts ■
Against Software Piracy
■
Boolean Processor
Bit-Addressable RAM
Programmable Full Duplex Serial
Channel
111 Instructions (64 Single-Cycle)
64K External Data Memory Space
Extended Temperature Range
(–40”C to +85”C)
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
8751H-8 is identical to the 8751H 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
Intsrnal Memory Timera/
Event Counters
Interrupts
Program Data
8031AH
none 128
X 8 RAM 2 x 18-Bit 5
8051AH 4K
X 8 ROM 128 X 8 RAM 2 x 16-Bit 5
6051AHP
4K
X 6 ROM 128 X 8 RAM 2 x 16-Bit
5
8751H
4K
X 8 EPROM 128 X 8 RAM 2 x 16-Bit 5
8751H-8 4K
X 8 EPROM 128 X 6 RAM 2 x 16-Bit 5
6751BH
4K
X 8 EPROM 128 X 8 RAM 2 x 16-Bit
5
8032AH
none 256
X 6 RAM 3 x 16-Bit 6
6052AH 8K
X 8 ROM 256 X 8 RAM 3 x 16-Bit 6
8752BH 8K
X 8 EPROM 256 X 8 RAM 3 x 16-Bit 6
IntelCorporationassumes noresponsibilityfor the use of any circuit~ otherthan circuitryembodiedin an Intel product.No other circuitpatent
licenses are implied.Informationcontained herein supersedes previouslypublishedspecificationson theaa davices from Intel.
O INTEL CORPORATION, 1994
October 1994 Order Numben 272318-002
