Microelectronics

Designer's Guide to the Cypress PSoC by Robert Ashby

By Robert Ashby

This it the 1st technical reference booklet to be had at the PSoC, and it deals the main complete mixture of technical facts, instance code, and descriptive prose you will find anyplace. Embedded layout professional Robert Ashby will advisor you thru the total PSoC international, offering thorough assurance of gadget characteristic, layout, programming and improvement of the software-reconfigurable PSoC. He stocks his most sensible assistance, methods, and methods to help you to make use of the versatile and cheap PSoC to its maximum capability, with no less than heartaches and past due nights. With its emphasis on designing for adaptability -- a characteristic of the maximum value in trendy fast moving and cost-pressured layout cycles -- this e-book will deliver you on top of things fast 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 exact functions are integrated during the textual content, with the assisting pattern resource code. This necessary code is usually supplied at the better half CD-ROM so that you can simply adapt it in your personal designs. * the 1st self sustaining technical reference on hand at the PSoC, a product line experiencing explosive development within the embedded layout international * program examples, pattern code, and layout information and methods gets readers get up-to-speed quick * spouse CD-ROM contains all instance code from ebook, in order that engineers can simply adapt it to their very own designs

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Following is an example: C Language Assembly Language and comments F = D + C mov A,[D] ;move D to accumulator where I can add add A,[C] ;add C to D, result is left in accumulator mov [F],A ;move result to F 12 Introduction to Microcontroller Basics Addressing Methods There are various methods in microcontrollers to address memory locations. The methods are referred to as addressing modes in the PSoC. The help file for the PSoC mentions ten different addressing modes, but there are only four different concepts to learn.

Indirect Post Increment – There is only one instruction that utilizes the indirect post increment addressing method. That instruction is mvi. The mvi instruction has the accumulator as the source or destination. A direct address RAM location is the other operand of the instruction. The contents of the RAM location points to the memory location used as the source or destination for the instruction and 14 Introduction to Microcontroller Basics the RAM location is then incremented after the move has occurred.

What has really happened is that the data register hasn’t been asserted correctly or it has been overwritten. Let’s look now at the resistive states of the I/O pins. The default power-up state for the drive mode registers for the 26xxx part is 0x00. That means that the chip defaults to the resistive pull-down state. A close look at the logic of the system will show that having a 0 for both DM1 and DM0 will turn on gates B or D depending on the state of the data register. If the data register state is low, then the D gate will turn on.

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