Thursday, 10 December 2009 01:36
Sai Prashanth
Usually PWMs are used for applications like Motor control, LED control etc. A PWM (Pulse Width Modulator) has a variable pulse width, where the width of the pulse can be varied from 0 to 100% of its period. In the PSoC, a conventional PWM has a simple down counter and a compare register. When the value in the Count register is less than or equal to the Compare register the Compare output goes high. The pulse width of the PWM can be varied by changing the value in the Compare register. The waveform of a conventional PWM operating at 50% duty cycle and its spectrum plot are shown below.
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Thursday, 10 December 2009 01:26
Dinesh Babu
This example project demonstrates using the high level UART User module APIs how to receive and decode a command string with parameters. A command string with parameters is transmitted from hyperterminal and the project receives and decodes the string and echoes back the command and the parameters. Use the below link to download the project and documentation from Cypress website.
Example Project - UART
Saturday, 28 November 2009 04:10
M. Ganesh Raaja
Question: What is the significance of the Analog Power parameter in the Global Resources? What are the guidelines to select the correct setting?
Answer: The Analog Power parameter sets the power at which the internal reference generator operates and also sets the power to the SC blocks of the device. Below is the excerpt from the Technical Reference Manual from the Analog reference section.
The reference array supplies voltage to all blocks and current to the Switched Capacitor blocks. At higher block clock rates, there is increased reference current demand; the reference power should be set equal to the highest power level of the analog blocks used.
So, for example, if you have a PGA operating at Medium power and another Comparator operating at High Power, the Reference power should be set to Ref High. Also, if you have any analog resource that occupies an SC Block (like ADC, DAC, Filters etc), the Reference power should be set to "SC On / Ref xxx". If the reference is set to "SC Off / Ref xxx", the analog resources placed in the SC Blocks will not work.
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