The T8051 is a very low gate count, single-chip 8-bit microcontroller which executes ASM51 instruction set. It provides an interface for serial communication, timer, multi-purpose I/O ports, hardware interrupts and debugger interface. The T8051 design bases on another well-proven Evatronix' product - the R8051XC, however, the T8051 architecture is designed to achieve a very low gate count. To meet this requirement, a wide range of resources is effectively shared between several stages of instruction execution inside the CPU. The gate count is the trump card of the T8051- there is no 8051-compatible microcontroller on the market that would even come close to the achieved values. Target applications for the T8051 are those in which the microcontroller replaces hard-coded control logic, being easy re-programmable and allowing modifications to the control algorithm without the need to re-design the chip. An implemented complex debugging system is an additional value.