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The AT89LS51-16JU is a microcontroller manufactured by Atmel (now part of Microchip Technology). Below are its specifications, descriptions, and features:

Specifications:

• Manufacturer: Atmel
• Core: 8051
• Operating Frequency: 0 Hz to 16 MHz
• Program Memory Size: 4 KB (Flash)
• RAM Size: 128 Bytes
• EEPROM Size: None
• I/O Pins: 32
• Timers: 2 x 16-bit
• UART: 1
• Interrupts: 6
• Operating Voltage: 4.0V to 5.5V
• Package: PLCC-44
• Operating Temperature: -40°C to +85°C

Descriptions:

• The AT89LS51-16JU is a low-power, high-performance CMOS 8-bit microcontroller based on the 8051 architecture.
• It features 4 KB of Flash memory for program storage and 128 bytes of RAM for data storage.
• It operates at a maximum clock frequency of 16 MHz and supports low-power idle and power-down modes.
• The microcontroller includes two 16-bit timers/counters, a full-duplex UART, and 32 programmable I/O lines.

Features:

• 8051-Compatible Core
• 4 KB In-System Programmable (ISP) Flash Memory
• 128 Bytes of On-Chip RAM
• 32 Programmable I/O Lines
• Two 16-Bit Timer/Counters
• Full-Duplex UART Serial Port
• Six Interrupt Sources
• Low-Power Idle and Power-Down Modes
• Watchdog Timer (WDT)
• Power-On Reset (POR)
• PLCC-44 Package

This microcontroller is commonly used in embedded systems, industrial control, and consumer electronics applications.