Question

In assembly language HCS12 please

art (b) PRE-LAB 1) Write an assembly program which flashes Blue LED 10 times with on time of 0.25 seconds and off time of 0.25 seconds

Answer 1

Central Processing MAR Unit Memory N - 2K Units of M bits each MBR Control Figure: Monolithic View of Computer Memory In this monolithic view, the CPU provides K address bits to access N 2K memory entries, each of which has M bits, and at least two control signals to manage memory The linear view of memory is a way to think logically about the organization of the memory. This view has the advantage of being rather simple, but has the disadvantage of describing accurately only technologies that have long been obsolete. However, it is a consistent model that is worth mention. The following diagram illustrates the linear model. K-to-2K Decoder Word Memory Select MAR Enable Selec MBR

We now discuss tec nologies used to store binarv n ormation e irst topic is to make a st ofre uren ents or de ices use to n ement ina memo . 1) Two well defined and distinct states 2) The device must be able to switch states reliably 3) The probability of a spontaneous state transition must be extremely low. 4) State switching must be as fast as possible. 5) The device must be small and cheap so that large capacity memories are practical. There are a number of memory technologies that were developed in the last half of the twentieth century. Most of these are now obsolete. There are three that are worth mention: 1) Core Memory (now obsolete, but new designs may be introduced soon) 2) Static RAM 3) Dynamic RAM