Specifications:
- Memory:
- 4KB Flash programmable and erasable read-only memory (PEROM)
- 128 bytes RAM
- Ports:
- P1, P2, P3, P0 – all 8-bit bi-directional ports
- P0 and P2: Used for low byte and high byte addresses when connected to external memory
- P3: Multiplexed pins for special functions like serial communication, hardware interrupts, timer inputs, and read/write operations from external memory
- Timers: 2 timers
- Interrupts: 6 interrupts
- Communication: Inbuilt UART for serial communication, programmable for different baud rates
Pin Description:
Pin No |
Function |
Name |
1 |
8-bit input/output port (P1) pins |
P1.0 to P1.7 |
9 |
Reset pin; Active high |
Reset |
10 |
Input (receiver) for serial communication |
RxD |
11 |
8-bit input/output port (P3) pins |
P3.0 |
12 |
Output (transmitter) for serial communication |
TxD |
13 |
External interrupt 1 |
Int0 |
14 |
External interrupt 2 |
Int1 |
15 |
Timer1 external input |
T0 |
16 |
Timer2 external input |
T1 |
17 |
Write to external data memory |
Write |
18 |
Read from external data memory |
Read |
19 |
Quartz crystal oscillator (up to 24 MHz) |
Crystal 2 |
20 |
Ground (0V) |
Ground |
21 |
8-bit input/output port (P2) pins |
P2.0 to P2.7 |
29 |
Program store enable; Read from external program memory |
PSEN |
30 |
Address Latch Enable |
ALE |
31 |
External Access Enable; Vcc for internal program executions |
EA |
32 |
8-bit input/output port (P0) pins |
P0.0 to P0.7 |
40 |
Supply voltage; 5V (up to 6.6V) |
Vcc |
Package:
- 1 x AT89C51 8-bit Microcontroller (40 pins)
Description:
The AT89C51 is an 8-bit microcontroller from Atmel's 8051 family, equipped with 4KB Flash memory and 128 bytes RAM. It features four 8-bit bi-directional ports, with P0 and P2 used for addressing in external memory configurations. The device offers a variety of powerful features, including built-in UART for serial communication, hardware interrupts, and timers. The AT89C51 is designed for high-efficiency applications that require low power consumption and reliable data processing. This microcontroller is ideal for embedded systems and control applications that involve serial communication and memory interfacing.
FAQ:
-
What is the memory size of the AT89C51?
- The AT89C51 has 4KB Flash memory and 128 bytes of RAM.
-
How many interrupts does the AT89C51 have?
- The AT89C51 includes a total of 6 interrupts.
-
What kind of serial communication does the AT89C51 support?
- The AT89C51 has an inbuilt UART that supports serial communication with different baud rates.
-
How many ports are available on the AT89C51?
- The AT89C51 has four 8-bit bi-directional ports: P1, P2, P3, and P0.
-
What is the supply voltage required for the AT89C51?
- The AT89C51 operates at 5V (up to 6.6V) supply voltage.
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