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Accessing PSoC 3/5 Registers in Firmware

Last Updated: May 07, 2012

How do I access (Read/Write) the Registers of PSoC 3/5 in firmware?


To access registers in firmware, use the following functions.

CY_SET_REG8(addr, value);


Similarly REG16 & REG32 functions are also there. Please refer to System Referecne Guide for more APIs.


CY_SET_REG8(CYDEV_IO_PRT_PRT1_DR, 0X01)); // Write the value 1 to Port 1 Data Register.

Port1Register = CY_GET_REG8(CYDEV_IO_PRT_PRT1_DR);  // Read the Port 1 Data Register into a Variable "Port1Register"

The macro is defined in the header file, cytypes.h".  PSoC 3/5 registers are defined in the header file "cydevice.h"

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