Q.Mention the futures of 8051.

The 8051 is an 8-bit microcontroller whose on-chip resources — its memory sizes, timers, ports, serial port and interrupt sources — are its defining features.

[!ANSWER]

Features of the 8051: 4K bytes on-chip ROM, 128 bytes RAM, two 16-bit timers/counters (T0, T1), 32 I/O pins arranged as four 8-bit ports (P0–P3), one serial port, and five interrupt sources (two external, three internal + others); an 8-bit CPU with registers A and B, a 16-bit program counter, control registers (TCON, TMOD, SCON, PCON, IP, IE), oscillator/clock circuits, and CISC architecture. [!NOTE] The textbook's feature list prints six interrupts, but its own architecture description lists two external + three internal = five interrupt sources, which is the standard 8051 figure used here.

[!TLDR]

The 8051 is an 8-bit microcontroller with 4K ROM, 128 bytes RAM, two 16-bit timers, 32 I/O pins (four 8-bit ports), one serial port and five interrupt sources, built on a CISC architecture.

The 8051 is an 8-bit microcontroller with 128 bytes of RAM, 4K bytes of on-chip ROM, two timers, one serial port and four ports (each 8 bits wide), all on a single chip. Its main features (a standard 5-mark question in the Karnataka 2nd PUC Electronics course) are:

Feature summary:

• ROM: 4K bytes
• RAM: 128 bytes
• Timers: 2
• I/O pins: 32
• Serial port: 1
• Interrupt sources: 6

Architectural features:

• 16-bit program counter.
• Internal ROM or EPROM of 4K bytes.
• 8-bit CPU with registers A (accumulator) and B.
• Internal RAM of 128 bytes.
• 32 I/O pins arranged as four 8-bit ports: P0–P3.
• Two 16-bit timers/counters: T0 and T1.
• Two external and three internal interrupt sources.
• Oscillator and clock circuits.
• Control registers: TCON, TMOD, SCON, PCON, IP and IE.
• CISC (Complex Instruction Set Computer) architecture.

There are two other members in the 8051 family — the 8052 and the 8031.

[!ANSWER]

The 8051 features: 4K bytes ROM, 128 bytes RAM, two 16-bit timers (T0, T1), 32 I/O pins as four 8-bit ports (P0–P3), one serial port, five interrupt sources (two external, three internal), a 16-bit program counter, an 8-bit CPU with registers A and B, control registers (TCON, TMOD, SCON, PCON, IP, IE), oscillator/clock circuits, and CISC architecture. [!NOTE] The textbook's feature list prints six interrupts, but its own architecture description lists two external + three internal = five interrupt sources, which is the standard 8051 figure used here.