AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 232

• 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

Bit 1:
This bit controls which entity, the USB core or the 8051, handles USB device requests.
When RENUM=0, the EZ-USB core handles all device requests. When RENUM=1, the
8051 handles all device requests except Set_Address.
The 8051 sets RENUM=1 during a bus disconnect to transfer USB control to the 8051.
The EZ-USB core automatically sets RENUM=1 under two conditions:
Bit 0:
The 8051 sets SIGRSUME=1 to drive the “K” state onto the USB bus. This should be
done only by a device that is capable of remote wakeup, and then only during the SUS-
PEND state. To signal RESUME, the 8051 sets SIGRSUME=1, waits 10-15 ms, then sets
SIGRSUME=0.
EZ-USB TRM v1.9
1. Completion of a “B2” boot load (Chapter 5, "EZ-USB Enumeration and ReNumer-
2. When external memory is used (EA=1) and no boot I
ation ").
Section 10.3.3, "External ROM").
RENUM
SIGRSUME Signal remote device resume
ReNumerate
Chapter 12. EZ-USB Registers
2
C EEPROM is used (see
Page 12-39