T51 MCU - 8052 Compatible Microcontroller Core

T51 MCU - 8052 Compatible Microcontroller Core


Category: Processor

Created: April 25, 2002

Updated: January 27, 2020

Language: VHDL

Other project properties

Development Status: Stable

Additional info: FPGA proven

WishBone compliant: Yes

WishBone version: n/a

License: LGPL


8052 compatible microcontroller core. Two different top levels: T8052: - Single cycle synchronous RAM/ROM - Wishbone bus interface for memory mapped peripherals T8032: - Wishbone bus interface A utility to create VHDL ROMs is also included. To create a ROM compatible with the 8052 core type: hex2rom [-b] inputfile.hex ROM52 13b8s > ROM52.vhd Leonardo Spectrum can infer the ROMs created with hex2rom to Xilinx block RAM. I have also modified the baud rate recognition of the BASIC-52 ROM to support the faster instruction timing. The modified BASIC-52 might also work with other high speed 8032 compatible cores such as the 80c320. Browse source code here. Download latest tarball here.


- All peripherals/interrupts implemented
- Single cycle per byte fetch
- Supports synchronous RAM/ROM
- Single cycle MOVX (8052)
- Optional second DPTR
- Technology independent
- Three stage pipeline