8031 CPU with 128×8 RAM and I/O – Datasheet

The 8031 CPU with 128×8 RAM and I/O controller is 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. The instruction set provides a convenient menu of 8-bit arithmetic instructions, including multiply and divides Instructions.
The 8751H is an EPROM version of the 8051AH. It has 4 Kbytes of electrically programmable ROM which can be erased with ultraviolet light. It is fully compatible with the 8051AH but incorporates one additional feature Program Memory Security bit that can be used to protect the EPROM against unauthorized readout.

8031 Pinout

8031 Pin Configuration

Pin No	Pin Name	Description
1-8	P1.0-P1.7	Port 1
9	RST	Reset
10	P3.0/RXD	Port 3.0 / Serial Receive Pin
11	P3.1/TXD	Port 3.1 / Serial Transmit Pin
12	P3.2/INT0	Port 3.2 / Interrupt 0 (Active Low)
13	P3.3/INT1	Port 3.3 / Interrupt 1 (Active Low)
14	P3.4/T0	Port 3.4 / Timer 0
15	P3.5/T1	Port 3.5 / Timer 1
16	P3.6/WR	Port 3.6 / Write (Active Low)
17	P3.7/RD	Port 3.7 / Read (Active Low)
18	XTAL2	Crystal Input
19	XTAL1	Crystal Input
20	Vss	Ground
21-28	P2.0-P2.7	Port 2
29	PSEN	Program Store Enable (Active Low)
30	ALE	Address Latch Enable
31	EA	External Memory Enable (Active Low)
32-39	P0.7-P0.1	Port 0
40	Vcc	Positive Supply

8031 Key Features

• High Performance HMOS Process
• Internal Timers/Event Counters
• 2-Level Interrupt Priority Structure
• 32 1/O 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

Application

• Optimized for control applications.

You can download 8031 CPU with 128×8 RAM and I/O – Datasheet from the link given below: