9.4
USB Signaling Interrupts
Figure 9-2 shows the 21 USB requests that share the 8051 USB (INT2) interrupt. The bot-
tom IRQ, EP7-OUT, is expanded in the diagram to show the logic associated with each
USB interrupt request. Vector 05, not shown in the diagram, exists only in the AN2122/
AN2126, and is described later in this chapter.
EZ-USB 8051
00 SUDAV
01 SOF
02 SUTOK
03 SUSP
04 URES
05 IBN Int
06 EP0-IN
07 EP0-OUT
EIE.0
08 EP1-IN
8051 "USB"
09 EP1-OUT
S
R
Interrupt
0A EP2-IN
0B EP2-OUT
0C EP3-IN
0D EP3-OUT
0E EP4-IN
0F EP4-OUT
10 EP5-IN
EXIF.4(rd)
EXIF.4(0)
11 EP5-OUT
12 EP6-IN
13 EP6-OUT
14 EP7-IN
OUT07IEN.7
15 EP7-OUT
S
R
IN07IRQ.7(1)
IN07IRQ.7 (rd)
Interrupt Request Latch
0
IV4
IV3
IV2
IV1
IV0
0
0
AVEC
Figure 9-2. USB Interrupts
Page 9-4
Chapter 9. EZ-USB Interrupts
EZ-USB TRM v1.9
CYPRESS [ CYPRESS ]
