Sharing of the indirect addressing of the registers of a peripheral dedicated to emulation

摘要

The microcontroller accesses a battery of hidden registers used essentially in the field of emulation. The fact that there is a large number of hidden registers means that it is not possible to assign them an address by which they can be accessed directly. Since this battery of hidden registers has to be accessible by a host circuit and by a microprocessor, recourse is had to a method of indirect addressing by means of two peripheral control registers. A priority signal obliges the microprocessor to wait for the read and write resources to be released by the host circuit to perform these instructions.