AN2131SC Cypress Semiconductor Corp, AN2131SC Datasheet - Page 220

• Manufacturer Part Number: AN2131SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131SC

• Applications: USB Microcontroller
• Core Processor: 8051
• Program Memory Type: ROMless
• Controller Series: AN213x
• Ram Size: 8K x 8
• Interface: I²C, USB
• Number Of I /o: 16
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1306; AN2131SC

* AN2122/AN2126 only.
These bits are set when a bulk IN endpoint (0-6) received an IN token while the endpoint
was not armed for data transfer. In this case the SIE automatically sends a NAK response,
and sets the corresponding IBNIRQ bit. If the IBN interrupt is enabled (USBIEN.5=1),
and the endpoint interrupt is enabled in the IBNIEN register, an interrupt is request gener-
ated. The 8051 can test the IBNIRQ register to determine which of the endpoints caused
the interrupt. The 8051 clears an IBNIRQ bit by writing a “1” to it.
Each of the individual IN endpoints may be enabled for an IBN interrupt using the IBNEN
register. The 8051 sets an interrupt enable bit to 1 to enable the corresponding interrupt.
EZ-USB TRM v1.9
IBNIRQ
IBNIEN
R/W
R/W
b7
b7
x
x
-
-
EP6IN
EP6IN
R/W
R/W
b6
b6
x
x
Figure 12-22. IN Bulk NAK Interrupt Request Register
Figure 12-23. IN Bulk NAK Interrupt Enable Register
EP5IN
EP5IN
R/W
R/W
IN Bulk NAK Interrupt Requests
b5
b5
x
IN Bulk NAK Interrupt Enables
0
Chapter 12. EZ-USB Registers
EP4IN
EP4IN
R/W
R/W
b4
b4
x
0
EP3IN
EP3IN
R/W
R/W
b3
b3
x
0
EP2IN
EP2IN
R/W
R/W
b2
b2
x
0
EP1IN
EP1IN
R/W
R/W
b1
b1
x
0
Page 12-27
EP0IN
EP0IN
R/W
R/W
b0
b0
x
0
7FB0
7FB1