AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 238

• 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

The 8051 sets VAL=1 for active endpoints, and VAL=0 for inactive endpoints. These bits
instruct the EZ-USB core to return a “no response” if an invalid endpoint is addressed.
The default values of these registers are set to support all endpoints that exist in the default
USB device (see Table 5-1).
EZ-USB TRM v1.9
INISOVAL
OUTISOVAL
OUT15VAL OUT14VAL OUT13VAL OUT12VAL OUT11VAL OUT10VAL
IN15VAL
R/W
R/W
b7
b7
0
0
IN14VAL
R/W
R/W
b6
b6
0
0
Figure 12-37. Isochronous IN/OUT Endpoint Valid Bits Register
IN13VAL
Isochronous OUT Endpoint Valid Bits
Isochronous IN Endpoint Valid Bits
R/W
R/W
b5
b5
0
0
Chapter 12. EZ-USB Registers
IN12VAL
R/W
R/W
b4
b4
0
0
IN11VAL
R/W
R/W
b3
b3
0
0
IN10VAL
R/W
R/W
b2
b2
1
1
OUT9VAL
IN9VAL
R/W
R/W
b1
b1
1
1
OUT8VAL
IN8VAL
Page 12-45
R/W
R/W
b0
b0
1
1
7FE0
7FE1