Power supply to PSoC-4 Chips | Cypress Semiconductor
Power supply to PSoC-4 Chips
Please varify if the power supply to the PSoC4200 TQFP-44 chip has been connected properly.
(See the attachment)
 Do we have to connect the VCCD pin to a voltage supply externally, or just bypass it?
 What is the function of XRES pin?
 Normally, on other MCUs there is only a VDD pin and not VCC. Why VDD and VCC both in PSOC? What is the purpose?