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Functional Description
21.3.15.4 Initiate a Transfer
Poll the bus busy (BB) bit in the I2C status register (I2C_IRQSTATUS_RAW). If it is cleared to 0 (bus not
busy), configure START/STOP (I2C_CON: STT / I2C_CON: STP condition to initiate a transfer) - only in
case of I2C operating mode (F/S mode).
21.3.15.5 Receive Data
Poll the receive data ready interrupt flag bit (RRDY) in the I2C status register (I2C_IRQSTATUS_RAW),
use the RRDY interrupt (I2C_IRQENABLE_SET.RRDY_IE set) or use the DMA RX (I2C_BUF.RDMA_EN
set together with I2C_DMARXENABLE_SET) to read the received data in the data receive register
(I2C_DATA). Use draining feature (I2C_IRQSTATUS_RAW.RDR enabled by
I2C_IRQENABLE_SET.RDR_IE)) if the transfer length is not equal with FIFO threshold.
21.3.15.6 Transmit Data
Poll the transmit data ready interrupt flag bit (XRDY) in the I2C status register (I2C_IRQSTATUS_RAW),
use the XRDY interrupt (I2C_IRQENABLE_SET.XRDY_IE set) or use the DMA TX (I2C_BUF.XDMA_EN
set together with I2C_DMATXENABLE_SET) to write data into the data transmit register (I2C_DATA). Use
draining feature (I2C_IRQSTATUS_RAW.XDR enabled by I2C_IRQENABLE_SET.XDR_IE)) if the transfer
length is not equal with FIFO threshold.
3715
SPRUH73H–October 2011–Revised April 2013 I2C
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