Specifications

CY8C21123/CY8C21223/CY8C21323

Document Number: 38-12022 Rev. *Y Page 12 of 46

This section lists the registers of the CY8C21x23 PSoC device.

For detailed register information, refer the PSoC Technical

Reference Manual.

The register conventions specific to this section are listed in the

following table.

The PSoC device has a total register address space of

512 bytes. The register space is referred to as I/O space and is

divided into two banks. The XOI bit in the Flag register (CPU_F)

determines the bank you are currently in. When the XOI bit is set,

you are in Bank 1.

Note In the following register mapping tables, blank fields are

Reserved and must not be accessed.

Table 7. Register Conventions

Convention Description

R Read register or bit(s)

W Write register or bit(s)

L Logical register or bit(s)

C Clearable register or bit(s)

# Access is bit specific