AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 78

• 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

For purposes of downloading 8051 code, the Default USB Device requires only CON-
TROL endpoint zero. Nevertheless, the USB default machine is enhanced to support
other endpoints as shown in Figure 5-1 (note the alternate settings 1 and 2). This enhance-
ment is provided to allow the developer to get a head start generating USB traffic and
learning the USB system. All the descriptors are automatically handled by the EZ-USB
core, so the developer can immediately start writing code to transfer data over USB using
these pre-configured endpoints.
When the EZ-USB core establishes the Default USB Device, it also sets the proper end-
point configuration bits to match the descriptor data supplied by the EZ-USB core. For
example, bulk endpoints 2, 4, and 6 are implemented in the Default USB Device, so the
EZ-USB core sets the corresponding EPVAL bits. Chapter 6, “EZ-Bulk Transfers” con-
tains a detailed explanation of the EPVAL bits.
Tables 5-9 through 5-13 show the various descriptors returned to the host by the EZ-USB
core when ReNum=0. These tables describe the USB endpoints defined in Table 5-1,
along with other USB details, and should be useful to help understand the structure of
USB descriptors.
EZ-USB TRM v1.9
Chapter 5. EZ-USB CPU
Page 5-3