Datasheet

136
4337K–USB–04/08
AT89C5130A/31A-M
Figure 21-13. Example of V
REF
Connection
Figure 21-14. Disconnect Timing
21.10 USB Interrupt System
21.10.1 Interrupt System Priorities
Figure 21-15. USB Interrupt Control System
Table 21-2. Priority Levels
D-
D+
D-
D+
GND
V
CC
V
REF
1.5 kW
USB-B Connector
1
2
3
4
AT89C5131
D+
D-
V
SS
V
IL
V
IHZ
(min)
Device
Disconnected
Disconnect
Detected
> = 2,5 ms
EUSB
IE1.6
EA
IE0.7
USB
Controller
IPH/L
Interrupt Enable Lowest Priority InterruptsPriority Enable
00
01
10
11
D+
D-
IPHUSB IPLUSB USB Priority Level
0 0 0 Lowest
0 1 1
1 0 2
1 1 3 Highest