8051 Microcontroller

8051 is the microcontroller developed by Intel. Following are the features of 8051 Microcontroller: 
• It houses 8 BIT CPU.
• 4 KByte ROM used for code or program storage 
• 128 Byte RAM to store data or variables used in program 
• 32 Input/Output lines with 4 ports ( 8 lines per port)
• 2 Timers used for introducing delay and for setting the baud rate for data communication.
• 1 serial Port with one TxD and one RxD LINE used for serial communication with external devices.
• 6 Interrupt Sources
• Clock oscillator circuit runs at 12MHz FREQUENCY. 


8085 Microprocessor

8085 is the microprocessor developed by Intel. Following are the features of 8085 Microprocessor: 
• It is 8 bit size processor developed as single chip using N-MOS.
• It has multiplexed address and data bus on 8 lines AD0 to AD7.
• The maximum clock frequency used in 8085 is 3 MHz.
• It has 40 pins and runs at 5V power supply.
• There are 5 hardware interrupts viz. TRAP, INTR, RST5.5, RST6.5, RST7.5 
• It has about 74 programming instructions with 4 addressing modes. 
• It does not house memory, but it has 16 address lines which can access 64K bytes (2^16) of externally connected memory. 
• It has 8 bit lines which can address 256 (~2^8) ports connected externally. 
• It has TWO serial lines viz. SID and SOD. These can be connected with serial peripherals. 
• It consists of ACC, one flag register, 6 general PURPOSE registers and two special registers(SP-Stack Pointer, PC-Program Counter).