EZ-USB Datasheet, PDF (47/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

2.3 EZ-USB Enhancements
The EZ-USB chip provides additional enhancements outside the 8051. These include:
• Fast external transfers (Autopointer, Fast Transfer Mode)
• Vectored USB interrupts (Autovector)
• Separate buffers for SETUP and DATA portions of a CONTROL transfer.
• Breakpoint Facility.
2.4 EZ-USB Register Interface
The 8051 communicates with the EZ-USB core through a set of memory mapped regis-
ters. These registers are grouped as follows:
• Endpoint buffers and FIFOs
• 8051 control
• IO ports
• Fast Transfer
• I²C Controller
• Interrupts
• USB Functions
These registers and their functions are described throughout this manual. A full descrip-
tion of every register and bit appears in Chapter 12, “EZ-USB Registers.”
Page 2-2
Chapter 2. EZ-USB CPU
EZ-USB TRM v1.9