AN2131QC Datasheet, PDF (195/334 Pages) Cypress Semiconductor – The EZ-USBTM Integrated Circuit

Other Conventions
USB
ADDR
VAL
FRAME
PTR
Indicates a global (not endpoint-specific) USB function.
Is an address.
Means “valid.”
Is a frame count.
Is an address pointer.
Register Name
Register Function
Address
b7
bitname
R, W access
Default val
b6
bitname
R, W access
Default val
b5
bitname
R, W access
Default val
b4
bitname
R, W access
Default val
b3
bitname
R, W access
Default val
b2
bitname
R, W access
Default val
b1
bitname
R, W access
Default val
b0
bitname
R, W access
Default val
Figure 12-1. Register Description Format
Figure 12-1 illustrates the register description format used in this chapter.
• The top line shows the register name, functional description, and address in the
EZ-USB memory.
• The second line shows the bit position in the register.
• The third line shows the name of each bit in the register.
• The fourth line shows 8051 accessibility: R(ead), W(rite), or R/W.
• The fifth line shows the default value. These values apply after a Power-On-Reset
(POR).
Page 12-2
Chapter 12. EZ-USB Registers
EZ-USB TRM v1.9