Question

The 8051 Microcontroller has on chip timers.

• A. 1
• B. 2
• C. 5
• D. 3

Hint:

Remember "Two and Two": The standard 8051 has 2 Timers (Timer 0 and Timer 1) and 2 External Interrupts (INT0 and INT1).

Answer 1

The Correct Option is B

The Intel 8051 is a classic 8-bit microcontroller architecture that includes several standard hardware peripherals integrated directly onto the chip to support various timing and counting tasks. 1. Timer/Counter Resources: Standard 8051 microcontrollers are equipped with

two 16-bit Timer/Counter modules.

• Timer 0: A 16-bit register (accessed as two 8-bit registers, TH0 and TL0).

• Timer 1: A 16-bit register (accessed as two 8-bit registers, TH1 and TL1).

2. Modes of Operation: These timers can operate in four different modes (Mode 0 to Mode 3), allowing them to function as interval timers (counting internal clock cycles) or as event counters (counting external pulses applied to the T0 and T1 pins).

3. Application: Timer 1 is frequently utilized for generating the baud rate for serial communication via the UART, while Timer 0 is often used for general-purpose timing delays or frequency measurement in embedded applications.