AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 214

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131QC

• 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: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1307

* AN2122/AN2126 only.
USBIRQ indicates the interrupt request status of the USB reset, suspend, setup token, start
of frame, and setup data available interrupts.
Bit 5:
This bit is in the AN2122 and AN2126 versions only. The EZ-USB core sets this bit when
any of the IN bulk endpoints responds to an IN token with a NAK. This interrupt occurs
when the host sends an IN token to a bulk IN endpoint which has not been armed by the
8051 writing its byte count register. Individual enables and requests (per endpoint) are
controlled by the IBNIRQ and IBNIEN registers (7FB0, 7FB1).
Bit 4:
The EZ-USB core sets this bit to “1” when it detects a USB bus reset.
Because this bit can change state while the 8051 is in reset, it may be active when the 8051
comes out of reset, although it is reset to “0” by a power-on reset. Write a “1” to this bit to
clear the interrupt request. See Chapter 10, "EZ-USB Resets" for more information about
this bit.
Bit 3:
The EZ-USB core sets this bit to “1” when it detects USB SUSPEND signaling (no bus
activity for 3 ms). Write a “1” to this bit to clear the interrupt request.
Because this bit can change state while the 8051 is in reset, it may be active when the 8051
comes out of reset, although it is reset to “0” by a power-on reset. See Chapter 11, "EZ-
USB Power Management" for more information about this bit.
EZ-USB TRM v1.9
USBIRQ
R/W
b7
0
-
IBNIR
URESIR
SUSPIR
R/W
b6
-
0
Figure 12-18. USB Interrupt Request (IRQ) Registers
IBNIR*
R/W
b5
0
IN Bulk NAK Interrupt Request
USB Reset Interrupt Request
USB Suspend Interrupt Request
USB Interrupt Request
Chapter 12. EZ-USB Registers
URESIR
R/W
b4
0
SUSPIR
R/W
b3
0
SUTOKIR
R/W
b2
0
SOFIR
R/W
b1
0
SUDAVIR
Page 12-21
R/W
b0
7FAB
0