Cypress Semiconductor FX2LP Technical Information Seite 377

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Chapter 15. Registers Page 15-57
Bit 5 INT6 INT6 Interrupt Request
Setting this bit to '1' configures this Port E pin as INT6.
Bit 4 RXD1OUT Mode 0: USART1 Synchronous Data Output
Mode 0: USART1 Synchronous Data Output.
Bit 3 RXD0OUT Mode 0: USART0 Synchronous Data Output
Mode 0: USART0 Synchronous Data Output.
Bit 2-0 T2OUT, T1OUT, T0OUT Serial Data
Serial mode 0 provides synchronous, half-duplex serial communication. For Serial Port 0,
serial data output occurs on the RXD0OUT pin, serial data is received on the RXD0 pin, and
the TXD0 pin provides the shift clock for both transmit and receive. Mode 0: Clock Output
Modes 1-3: Serial Port 0 Data Output.
15.8.4 I²C Compatible Bus Control and Status
Figure 15-59. I²C-Compatible Bus Control and Status
Bit 7 START Signal START Condition
Set the START bit to 1 to prepare a bus transfer. If START=1, the next write to I2DAT will
generate the start condition followed by the serialized byte of data in I2DAT. The firmware
loads byte data into I2DAT after setting the START bit. The bus controller clears the START bit
during the ACK interval.
Bit 6 STOP Signal STOP Condition
Set STOP=1 to terminate a bus transfer. The bus controller clears the STOP bit after complet-
ing the STOP condition. If the firmware 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 immedi-
ately on the bus. Data should not be written to I2CS or I2DAT until the STOP bit returns low.
I2CS I²C-Compatible Bus
Control and Status
E678
b7 b6 b5 b4 b3 b2 b1 b0
START STOP LASTRD ID1 ID0 BERR ACK DONE
R/W R/W R/W R R R R R
0 0 0 x x 0 0 0
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