PSoC 4xxx series
Contents
Securing device after programming
The Cypress CY8C4xxx and CYBLExxxx series devices provide chip-level protection which allows "permanent" protection of the device concerning read and write access. The sequence, to secure the device consists of multiple read / write accesses to special function registers of the CY8C4xxx and CYBLExxxx series devices.
Via J-Flash / Flasher ARM
The sequence to secure the device, needs to be added to the exit-steps of the J-Flash project. The exit steps will be executed at the end of an successful auto-programming process (Target -> Auto). J-Flash comes with an example project for the Cypress CYBLE-214009-00 device which contains a secure device programming sequence (File:Cypress CYBLE 214009-00.jflash). This sequence applies for all Cypress CY8C4xxx and CYBLExxxx series devices since they are compatible regarding secure procedure and can be adapted to fit custom requirements, by re-selecting the required device within the J-Flash project.
Unsecuring device before reprogramming
The Cypress CY8C4xxx and CYBLExxxx series devices provide chip-level protection which allows "permanent" protection of the device concerning read and write access. The sequence, to unsecure the device consists of multiple read / write accesses to special function registers of the Cypress CY8C4xxx and CYBLExxxx series devices MCU.
Via J-Flash / Flasher ARM
J-Flash detects if the device is secured. In case of a secured device a pop-up window occurs with request to unsecure the device. This sequence applies for all Cypress CY8C4xxx and CYBLExxxx series devices since they are compatible regarding secure procedure.