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AT89C5121 Datasheet 8-bit Microcontroller

Manufacturer: Atmel (now Microchip Technology)

Download the AT89C5121 datasheet PDF. This datasheet also includes the T83C variant, as both parts are published together in a single manufacturer document.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (T83C-5121.pdf) that lists specifications for multiple related part numbers.

Key Features

  • 80C51 Core.
  • 12 or 6 Clocks per Instruction (X1 and X2 Modes).
  • 256 Bytes Scratchpad RAM.
  • Dual Data Pointer.
  • Two 16-bit Timer/Counters: T0 and T1 T83C5121 with 16 Kbytes Mask ROM T85C5121 with 16 Kbytes Code RAM T89C5121 with 16 Kbytes Code RAM and 16 Kbytes EEPROM On-chip Expanded RAM (XRAM): 256 Bytes Versatile Host Serial Interface.
  • Full-duplex Enhanced UART (EUART) with Dedicated Baud Rate Generator (BRG): Most Standard Speeds up to 230K b.

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