By Robert Ashby
This it the 1st technical reference publication on hand at the PSoC, and it deals the main entire mixture of technical info, instance code, and descriptive prose you will discover at any place. Embedded layout professional Robert Ashby will consultant you thru the total PSoC global, delivering thorough insurance of gadget characteristic, layout, programming and improvement of the software-reconfigurable PSoC. He stocks his top advice, methods, and methods to help you to make use of the versatile and cheap PSoC to its maximum strength, with at the very least heartaches and past due nights. With its emphasis on designing for adaptability -- a characteristic of the maximum value in contemporary fast moving and cost-pressured layout cycles -- this e-book will deliver you on top of things speedy on every thing PSoC, from reminiscence administration to interconnects. you'll upload brains and able sign conditioning to a layout with one chip, providing you with severe flexibility for a comparatively low cost. particular program examples highlighting the PSoC's special functions are integrated during the textual content, with the aiding pattern resource code. This priceless code is usually supplied at the significant other CD-ROM so that you can simply adapt it on your personal designs. * the 1st self reliant technical reference on hand at the PSoC, a product line experiencing explosive development within the embedded layout international * software examples, pattern code, and layout assistance and strategies gets readers get up-to-speed fast * better half CD-ROM contains all instance code from publication, in order that engineers can simply adapt it to their very own designs
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Extra info for Designer's Guide to the Cypress PSoC
Example text
If the Cypress had a more complex instruction set, you might have been able to save one instruction by coding the following instructions. One instruction may not seem like much, but for this simple task it’s a 30% savings and those types of savings can add up quickly. mov add [value3],[value1] ;copy value1 to value3 [value3],[value2] ;value3 = sum of value1 + value2 26 Structure of the PSoC The first instruction in the list is completely valid. Fortunately, Cypress made an allotment to copy from register to register directly without going through the accumulator.
Once the interrupt service routine has finished executing and a RETI instruction is performed, the flags register is retrieved off of the stack. This re-enables the global interrupt enable bit. If you re-enable the global interrupt enable bit within the interrupt, the other interrupts are now able to occur before the first interrupt has finished processing its interrupt service routine. This can be very useful for critical tasks that must be serviced as quickly as possible and can’t simply wait until all other interrupts are processed.
At that time, the program counter and the flags register are saved on the stack and execution begins at the appropriate interrupt vector. At the vector location, there will be a long jump (LJMP) instruction that passes control to another section of code in your project, known as the interrupt service routine. After executing the code of the interrupt service routine, the return from interrupt (RETI) instruction will tell the processor to pop the flags register and program counter from the stack and return execution to the location in code that was interrupted when the interrupt occurred.