The instruction set of RlSC_SPM is limited and might not serve a particular application very well. Develop RISC-.5PM_e and an enhanced version of RISC_SPM with additional instructions that would be useful if it is to be an embedded processor within a vending machine that is to accept currency, make change, and dispense coffee in response to seleclions made by the customer. The allowed selections are identified in Figure P7-16. The machine is to assert signals that

(I) control dispensing units that blend the coffee according to the customer's choices.

(2) accept currency and dispense change, and

(3) sendmes- sages to a display panel .

Size Venti Grande Tall Coffee Normal Decaff Espresso Flavor Hazelnut Vanilla Raspberry Creamer Type Half-n-Half Whole Skim Creamer Amount Heavy Medium Tall Sweetener Type Sugar Artificial Light Sweetener Amount Heavy Medium Equal Size Venti Grande Tall Coffee Normal Decaff Espresso Flavor Hazelnut Vanilla Raspberry Creamer Type Half-n-Half Whole Skim Creamer Amount Heavy Medium Tall Sweetener Type Sugar Artificial Light Sweetener Amount Heavy Medium Equal