MICROPROCESSOR CIRCUIT FOR PORTABLE DATA CARRIERS

摘要

The invention relates to a microprocessor circuit comprising a control unit, a memory for free programming with at least one program comprising functions, a stack for the intermediate storage of data and a register bank comprising at least one register which contains an auxiliary register storing a number of bits. Each bit is associated with one of the registers in the register bank and indicates whether or not each register in the register bank contains information.