AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 233

• 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 7:
Q=0 indicates DATA0 and Q=1 indicates DATA1, for the endpoint selected by the IO and
EP[2..0] bits. The 8051 writes the endpoint select bits (IO and EP[2..0]), before reading
this value.
Bit 6:
After selecting the desired endpoint by writing the endpoint select bits (IO and EP[2..0])
the 8051 sets S=1 to set the data toggle to DATA1. The endpoint selection bits should not
be changed while this bit is written.
Bit 5:
After selecting the desired endpoint by writing the endpoint select bits (IO and EP[2..0])
the 8051 sets R=1 to set the data toggle to DATA0. The endpoint selection bits should not
be changed while this bit is written. For advice on when to reset the data toggle, see Chap-
ter 7, "EZ-USB Endpoint Zero."
Bit 4:
The 8051 sets this bit to select an endpoint direction prior to setting its R or S bit. IO=0
selects an OUT endpoint, IO=1 selects an IN endpoint.
Page 12-40
TOGCTL
Note
At this writing there is no known reason to set an endpoint data toggle to 1. This bit is
provided for generality and testing only.
b7
Q
R
x
Q
S
R
IO
R/W
b6
S
x
R/W
Figure 12-32. Data Toggle Control Register
b5
R
x
Data Toggle Value
Set Data Toggle to DATA1
Set Data Toggle to DATA0
Select IN or OUT endpoint
Chapter 12. EZ-USB Registers
Data Toggle Control
R/W
IO
b4
x
R/W
b3
0
x
EP2
R/W
b2
x
EP1
R/W
b1
x
EZ-USB TRM v1.9
EP0
R/W
b0
7FD7
x