AN2131SC Cypress Semiconductor Corp, AN2131SC Datasheet - Page 109

• 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

The IO bit selects the endpoint direction (1=IN, 0=OUT), and the EP2-EP1-EP0 bits select
the endpoint number. The Q bit, which is read-only, indicates the state of the data toggle
for the selected endpoint. Writing R=1 sets the data toggle to DATA0, and writing S=1
sets the data toggle to DATA1.
To clear an endpoint’s data toggle, the 8051 performs the following sequence:
After step 1, the 8051 may read the state of the data toggle by reading the TOGCTL regis-
ter checking bit 7.
Page 6-12
Note
At the present writing, there appears to be no reason to set a data toggle to DATA1. The
S bit is provided for generality.
•
•
Select the endpoint by writing the value 000D0EEE to the TOGCTL register,
where D is the direction and EEE is the endpoint number.
Clear the toggle bit by writing the value 001D0EEE to the TOGCTL register.
Chapter 6. EZ-USB CPU
EZ-USB TRM v1.9