Features of 8051 Microcontroller: The Features of 8051 Microcontroller family are as follows. 1. Single-supply +5 volt operation using HMOS technology. 2. 4096 bytes program memory on-chip (not on 8031). 3. 128 bytes data memory on-chip. 4. Four register banks. 5. 128 User-defined software flags. 6. 64 … (Read More)

Intel 8051 Architecture and 8031 Architecture: Fig. 12.2 shows the Intel 8051 Architecture and 8031 Architecture. It consists of a Central Processing Unit, two kinds of memory (data RAM plus program ROM/EPROM) Input/Output ports, the mode status, and data registers and … (Read More)

Timers and Counters in 8051 Microcontroller: The Timers and Counters in 8051 Microcontroller has two 16-bit Timer/Counter registers : Timer 0 and Timer 1. The 8052 has these two plus one more : Timer 2. All three can be configured to … (Read More)

Serial Communication Interface in Microprocessor: The Serial Communication Interface in Microprocessor is full duplex, meaning it can transmit and receive simultaneously. It is also receive-buffered, meaning it can commence reception of a second byte before a previously received byte has been … (Read More)

8051 Interrupts: The 8051 Interrupts provides 5 interrupt sources. The 8052 provides 6. These are shown in Fig. 12.28. The external Interrupts INT0 and INT1 can each- be either level-activated or transition-activated, depending on bits IT0 and IT1 in Register TCON. The … (Read More)

Arithmetic Instructions in 8051: The Arithmetic Instructions in 8051 of Basic Assembly Language Programming are ADD, ADDC, SUBB and DA The ADD instruction adds a byte variable with the accumulator, leaving the result in the accumulator: The carry flag is set if there … (Read More)

8051 Addressing Modes: The 8051 Addressing Modes architecture supports several distinct physical address spaces. On – chip program memory On – chip data memory External program memory External data memory On-chip special function registers The most of the instructions can operate with variables from these physical address … (Read More)