Send back any character received via RxD (P3.0) to TxD (P3.1). Baud rate: 9600, 11.0592 MHz crystal.
Hobbyists use the chip to learn the fundamentals of hardware automation. at89c2051 projects
: A 10\muF electrolytic capacitor pulled up to VCC and a 10k\Omega resistor pulled down to GND, connected to pin 1 (RST). Power : Connect Pin 20 to +5V VCC and Pin 10 to GND. Beginner Project: Digital Clock with 7-Segment Displays Send back any character received via RxD (P3
Since the AT89C2051 requires a 12V programming pulse on its Reset pin ( RST/VPP ), use a dedicated hardware burner like a universal parallel/USB programmer. Share public link : A 10\muF electrolytic capacitor pulled up to
: The book " Microcontroller Projects in C for the 8051 " by Dogan Ibrahim is widely recommended as it was written with the AT89C2051 specifically in mind.
using an Arduino Mega to mimic the high-voltage pulsing sequences required to write to the 2KB Flash memory.
#include // On the AT89C2051, the internal comparator status is reflected // directly in the Bit 7 of the ACSR register or via P3.7 tracking. sbit LED = P1^7; sbit BUZZER = P1^6; void main() LED = 0; BUZZER = 0; while(1) // If AIN0 (2.5V reference) is greater than AIN1 (Battery input), // it implies that the battery voltage has dropped below the safe threshold. if (P3_7 == 1) LED = 1; // Alert: Low Battery BUZZER = 1; else LED = 0; // Normal status BUZZER = 0; Use code with caution. Project 4: Configurable Industrial PWM DC Motor Controller