AN2131SC Cypress Semiconductor Corp, AN2131SC Datasheet - Page 213

• 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

These interrupt request (IRQ) registers indicate the pending interrupts for each bulk end-
point. An interrupt request (IR) bit becomes active when the BSY bit for an endpoint
makes a transition from one to zero (the endpoint becomes un-busy, giving access to the
8051). The IR bits function independently of the Interrupt Enable (IE) bits, so interrupt
requests are held whether or not the interrupts are enabled.
The 8051 clears an interrupt request bit by writing a “1” to it (see the following Note).
Page 12-20
IN07IRQ
OUT07IRQ
Note
Do not clear an IRQ bit by reading an IRQ register, ORing its contents with a bit mask,
and writing back the IRQ register. This will clear ALL pending interrupts. Instead, sim-
ply write the bit mask value (with the IRQ you want to clear) directly to the IRQ register.
OUT7IR
IN7IR
R/W
R/W
b7
b7
0
x
OUT6IR
IN6IR
R/W
R/W
b6
b6
0
x
Figure 12-17. IN/OUT Interrupt Request (IRQ) Registers
Endpoint 0-7 OUT Interrupt Requests
OUT5IR
IN5IR
Endpoint 0-7 IN Interrupt Request
R/W
R/W
b5
b5
0
x
Chapter 12. EZ-USB Registers
OUT4IR
IN4IR
R/W
R/W
b4
b4
0
x
OUT3IR
IN3IR
R/W
R/W
b3
b3
0
x
OUT2IR
IN2IR
R/W
R/W
b2
b2
0
x
OUT1IR
IN1IR
R/W
R/W
b1
b1
0
x
EZ-USB TRM v1.9
OUT0IR
IN0IR
R/W
R/W
b0
b0
7FAA
0
x
7FA9