AN2135SC Cypress Semiconductor Corp, AN2135SC Datasheet - Page 237

• Manufacturer Part Number: AN2135SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2135SC

• 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: 8
• 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: 428-1308

The 8051 sets VAL=1 for any 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,
instead of a NAK.
The default values of these registers are set to support all endpoints that exist in the default
USB device (see Table 5-1).
Page 12-44
IN07VAL
OUT07VAL
OUT7VAL
IN7VAL
R/W
R/W
b7
b7
0
0
OUT6VAL
IN6VAL
R/W
R/W
b6
b6
1
1
OUT5VAL
IN5VAL
R/W
R/W
b5
b5
Figure 12-36. IN/OUT Valid Bits Register
0
0
Endpoints 0-7 OUT Valid Bits
Endpoints 0-7 IN Valid Bits
Chapter 12. EZ-USB Registers
OUT4VAL
IN4VAL
R/W
R/W
b4
b4
1
1
OUT3VAL
IN3VAL
R/W
R/W
b3
b3
0
0
OUT2VAL
IN2VAL
R/W
R/W
b2
b2
1
1
OUT1VAL
IN1VAL
R/W
R/W
b1
b1
1
0
EZ-USB TRM v1.9
OUT0VAL
IN0VAL
R/W
R/W
7FDE
b0
b0
7FDF
1
1