AN2131-DK001 Cypress Semiconductor Corp, AN2131-DK001 Datasheet - Page 209

• Manufacturer Part Number: AN2131-DK001
• Description: KIT EZ-USB DEVELOPMENT BOARD
• Manufacturer: Cypress Semiconductor Corp

Specifications of AN2131-DK001

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1333

The 8051 uses these registers to transfer data over the EZ-USB I
Bit 7:
The 8051 sets the START bit to “1” to prepare an I
8051 load to I2DAT will generate the start condition followed by the serialized byte of
data in I2DAT. The 8051 loads byte data into I2DAT after setting the START bit. The I
controller clears the START bit during the ACK interval.
Bit 6:
The 8051 sets STOP=1 to terminate an I
STOP bit after completing the STOP condition. If the 8051 sets the STOP bit during a
byte transfer, the STOP condition will be generated immediately following the ACK phase
of the byte transfer. If no byte transfer is occurring when the STOP bit is set, the STOP
condition will be carried out immediately on the bus. Data should not be written to I2CS
or I2DAT until the STOP bit returns low.
Page 12-16
I2CS
I2DAT
12.10 I
START
R/W
R/W
D7
b7
b7
0
x
2
C Registers
STOP
START
STOP
R/W
R/W
D6
b6
b6
0
x
LASTRD
R/W
R/W
D5
b5
b5
0
x
Figure 12-14. I
Signal START condition
Signal STOP condition
I
Chapter 12. EZ-USB Registers
2
C Control and Status
R/W
ID1
D4
b4
b4
R
x
x
I
2
C bus transfer. The I
2
C Data
2
C Transfer Registers
ID0
R/W
D3
b3
b3
R
x
x
2
C bus transfer. If START=1, the next
BERR
R/W
D2
b2
b2
R
0
x
2
C controller clears the
2
C bus.
ACK
R/W
D1
b1
b1
R
0
x
EZ-USB TRM v1.9
DONE
R/W
D0
b0
b0
R
0
x
7FA5
7FA6
2
C