Datasheet

I
2
C Interface Controller
10−5
SLLS535E − April 2008 TUSB6250
10.4 Sequential-Read Operation
Once the I
2
C EEPROM address is set, the MCU can execute a sequential-read operation by executing the
following steps (this example illustrates a 32-byte sequential read):
Device Address
• The MCU sets I2CSCR [STOP] = 0. This forces the I
2
C controller to not generate a stop condition after
the I2CDIN register contents are received.
• The MCU writes the device address (R/W bit = 1) to the I2CADR register (read operation).
• The MCU writes a dummy byte to the I2CDOUT register (this starts the transfer on the SDA line).
• The RXF bit in the I2CSCR register is cleared.
• The contents of the I2CADR register are transmitted to the device (preceded by a start condition on
SDA).
N-Byte Read (31 Bytes)
• Data from the device is latched into the I2CDIN register (stop condition is not transmitted).
• The RXF bit in the I2CSCR register is set and interrupts the MCU, indicating that data is available.
• The MCU reads the I2CDIN register. This clears the RXF bit (I2CSCR [RXF] = 0).
• This operation repeats 31 times.
Last-Byte Read (Byte 32)
• The MCU sets I2CSCR [STOP] = 1. This forces the I
2
C controller to generate a stop condition after
the I2CDAI register contents are received.
• Data from the device is latched into the I2CDIN register (a stop condition is transmitted).
• The RXF bit in the I2CSCR register is set and interrupts the MCU, indicating that data is available.
• The MCU reads the I2CDIN register. This clears the RXF bit (I2CSCR [RXF] = 0).
• End