McSPI Registers
Table 24-18. McSPI Channel (i) Configuration Register (MCSPI_CH(i)CONF) Field Descriptions (continued)
Bit
Field
Value
Description
22-21
SPIENSLV
Channel 0 only and slave mode only: SPI slave select signal detection. Reserved bits (read returns 0)
for other cases.
0
Detection enabled only on SPIEN[0]
1h
Detection enabled only on SPIEN[1]
2h
Detection enabled only on SPIEN[2]
3h
Detection enabled only on SPIEN[3]
20
FORCE
Manual SPIEN assertion to keep SPIEN active between SPI words. (single channel master mode only)
0
Writing 0 into this bit drives the SPIEN line when MCSPI_CHCONF(i)[EPOL]=0, and drives it high when
MCSPI_CHCONF(i)[EPOL]=1.
1
Writing 1 into this bit drives the SPIEN line when MCSPI_CHCONF(i)[EPOL]=0, and drives it low when
MCSPI_CHCONF(i)[EPOL]=1
19
TURBO
Turbo mode.
0
Turbo is deactivated (recommended for single SPI word transfer).
1
Turbo is activated to maximize the throughput for multi-SPI word transfers.
18
IS
Input select
0
Data line 0 (SPIDAT[0]) selected for reception.
1
Data line 1 (SPIDAT[1]) selected for reception.
17
DPE1
Transmission enable for data line 1 (SPIDATAGZEN[1])
0
Data line 1 (SPIDAT[1]) selected for transmission
1
No transmission on data line 1 (SPIDAT[1])
16
DPE0
Transmission enable for data line 0 (SPIDATAGZEN[0])
0
Data line 0 (SPIDAT[0]) selected for transmission
1
No transmission on data line 0 (SPIDAT[0])
15
DMAR
DMA read request. The DMA read request line is asserted when the channel is enabled and new data
is available in the receive register of the channel. The DMA read request line is deasserted on read
completion of the receive register of the channel.
0
DMA read request is disabled.
1
DMA read request is enabled.
14
DMAW
DMA write request. The DMA write request line is asserted when the channel is enabled and the
MCSPI_TXn register of the channel is empty. The DMA write request line is deasserted on load
completion of the MCSPI_TXn register of the channel.
0
DMA write request is disabled.
1
DMA write request is enabled.
13-12
TRM
Transmit/receive modes.
0
Transmit and receive mode
1h
Receive-only mode
2h
Transmit-only mode
3h
Reserved
4047
SPRUH73H – October 2011 – Revised April 2013
Multichannel Serial Port Interface (McSPI)
Copyright © 2011–2013, Texas Instruments Incorporated