NuMicro™ Mini51 Technical Reference ManualFeb 9, 2012 Page 231 of 342 Revision V1.03NUMICRO™ MINI51 TECHNICAL REFERENCE MANUALFigure 5.11-4 Two Transfer (Burst Mode) in One Transaction5.11.4.8 LSB FirstThe LSB bit (SPI_CNTRL[10]) defines the data transmission either from LSB or from MSB to startto transmit/receive data.5.11.4.9 Transmit EdgeThe TX_NEG bit (SPI_CNTRL[2]) defines the data transmitted out either at negative edge or atpositive edge of serial clock SPICLK.5.11.4.10 Receive EdgeThe RX_NEG bit (SPI_CNTRL[1]) defines the data received in either at negative edge or atpositive edge of serial clock SPICLK.5.11.4.11 Word SuspendThe four bits field of SP_CYCLE (SPI_CNTRL[15:12]) provide a configurable suspend interval 2 ~17 serial clock periods between two successive transfer words in Master mode. The suspendinterval is from the last falling clock edge of the preceding transfer word to the first rising clockedge of the following transfer word if CLKP = 0. If CLKP = 1, the interval is from the rising clockedge of the preceding transfer word to the falling clock edge of the following transfer word. Thedefault value of SP_CYCLE is “0” (2 serial clock cycles), but to set these bits field has no anyeffects on data transfer process if TX_NUM = “00”.SPICLKMOSIMISO Tx0[30] Tx0[0] Tx1[31] Tx1[30] LSBTx1[0]MSBTx0[31]Rx0[30] Rx0[0] Rx1[31] Rx1[30] LSBRx1[0]MSBRx0[31]CLKP=0CLKP=1WordSuspend1st Transfer Word 2nd Transfer WordFigure 5.11-5 Word Suspend Mode5.11.4.12 Byte ReorderWhen the transfer is set as MSB first (LSB = 0) and the REORDER is enabled, the data stored inthe TX buffer and RX buffer will be rearranged in the order as [BYTE0, BYTE1, BYTE2, BYTE3] inTX_BIT_LEN = 32-bit mode, and the sequence of transmitted/received data will be BYTE0,BYTE1, BYTE2, and then BYTE3. If the TX_BIT_LEN is set as 24-bit mode, the data in TX bufferand RX buffer will be rearranged as [unknown byte, BYTE0, BYTE1, BYTE2] and the BYTE0,
