8051 Microcontroller and its application

2.1 MCS-51 Family Overview

MCS-51 - 

family (समूह) of microcontroller ICs  (name of group of microcontroller ICs)   [IC - Integrated Circuit]

manufactured (निर्माण) and marketed (विपणन) by Intel Corporation (USA) 

Second Source Suppliers (अन्य कंपनी जो इसे बनाती है)  - Siemens, AMD, Fujitsu, Philips

8051 Microcontroller contains following features/modules :- 

8051 के विभिन्न अवयव :- 

• ROM (4KB)   [KB - Kilo Bytes  where Kilo = 1024]
• RAM (128 Bytes)
• I/O Ports ( 4 and each 8-bit port)   [4x8 = 32 bits or pins are used for I/O Ports]
• Timers (T0, T1 - 16 bit timers)   2¹⁶ = 35536 
• Serial Interface (SDI, SDO) 
• External Code Memory (64 KB)
• External Data Memory (64 KB) 
• Boolean Processor (for Single Bit Operation)
• Bit-addressable memory 
• Multiply / Divider (4 $\mu$s) 

MCS-51 IC(s) Comparison (तुलना) :-