PROBLEM TO BE SOLVED: To make contexts switchable by transfer of cipher data minimally necessary for maintaining secrecy pretection under a multitasking environment.;SOLUTION: This microprocessor has a command deciphering part deciphering an enciphered program using a first cipher key (a program key)...
For micro computer, the design of CPU microprocessor, is not part of design interface between it and peripherals, but the input / output interface circuit design of equipment into relatively independent parts, through the micro computer hardware peripherals and they will all types of CPU connected ...
Thereisalsoamuchlargernumberofmemorylocationsinwhichtostoreinstructionsanddata.Inordertoincreasethenumberofmemorylocations,theaddressfieldsandhencetheinstructionsmustbelongerthan16bitsifweusethesameapproach.Thereareanumberofwaystoincreasetheaddressingrangeofthemicroprocessorwithoutincreasingtheinstructionlength:variable...
For this, the PC content, µP registers, and some status conditions are stored. The collection of all status bit conditions in a microprocessor is called PSW (program status word). During the interrupt cycle, the contents of the PC and PSW are pushed onto the stack. The branch address ...
This chapter focuses on the basic structures used for computer component interconnection. As background, the chapter begins with a brief examination of the basic components and their interface requirements. Then a functional overview is provided. We are then prepared to examine the use of buses to...