Method for manipulating a stack pointer with post increment/decrement operation

A method for controlling stack memory comprising the steps of:

• a) providing a system memory coupled to a processor;
• b) providing a stack memory coupled to said processor, said stack memory constructed and arranged to store values of a program counter;
• c) providing a stack pointer coupled to said stack memory, said stack pointer comprising:
• a master latch, said master latch storing a next unutilized address location in said stack memory device;
• a slave latch coupled to said master latch, said slave latch constructed and arranged to update said master latch;
• an increment/decrement circuit coupled to said master latch and further coupled to an input of said slave latch, said increment/decrement circuit constructed and arranged to determine a preceding address location to said next unutilized address location;
• a selection circuit coupled to said stack memory device, to said master latch and to said increment/decrement circuit;
• d) decoding an instruction at an address retained by said program counter;
• e) providing a call instruction whereby said address in said program counter is written to said stack memory;
• f) reading a memory location from said system memory;
• g) executing an operation of an instruction with said processor to obtain a result;
• and
• h) writing said result into a memory location on said system memory.