McSPI Registers
24.4.1.4 McSPI Interrupt Status Register (MCSPI_IRQSTATUS)
The McSPI interrupt status register (MCSPI_IRQSTATUS) regroups all the status of the module internal
events that can generate an interrupt. The MCSPI_IRQSTATUS is shown in
and described
in
NOTE:
In SYSTEST mode, the bits of this register have no meaning and always read 0.
Figure 24-29. McSPI Interrupt Status Register (MCSPI_IRQSTATUS)
31
18
17
16
Reserved
EOW
Rsvd
R/W-0
R/W-0
R-0
15
14
13
12
11
10
9
8
Rsvd
RX3_FULL
TX3_UNDERFLOW
TX3_EMPTY
Reserved
RX2_FULL
TX2_UNDERFLOW
TX2_EMPTY
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
7
6
5
4
3
2
1
0
Rsvd
RX1_FULL
TX1_UNDERFLOW
TX1_EMPTY
RX0_OVERFLOW
RX0_FULL
TX0_UNDERFLOW
TX0_EMPTY
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; -n = value after reset
Table 24-14. McSPI Interrupt Status Register (MCSPI_IRQSTATUS) Field Descriptions
Bit
Field
Value
Description
31-18
Reserved
0
Reads returns 0
17
EOW
End of word (EOW) count event when a channel is enabled using the FIFO buffer and the
channel has sent the number of McSPI words defined by the MCSPI_XFERLEVEL[WCNT].
Write 0
Event status bit is unchanged.
Read 0
Event false.
Write 1
Event status bit is reset.
Read 1
Event is pending.
16
Reserved
0
Reserved
15
Reserved
0
Reads returns 0
14
RX3_FULL
Receiver register is full or almost full. Only when Channel 3 is enabled. This bit indicate
FIFO almost full status when built-in FIFO is used for receive register
(MCSPI_CH3CONF[FFE3R] is set).
Write 0
Event status bit is unchanged.
Read 0
Event false.
Write 1
Event status bit is reset.
Read 1
Event is pending.
13
TX3_UNDERFLOW
Transmitter register underflow. Only when Channel 3 is enabled. The transmitter register is
empty (not updated by Host or DMA with new data) before its time slot assignment.
Exception: No TX_underflow event when no data has been loaded into the transmitter
register since channel has been enabled.
Write 0
Event status bit is unchanged.
Read 0
Event false.
Write 1
Event status bit is reset.
Read 1
Event is pending.
4037
SPRUH73H – October 2011 – Revised April 2013
Multichannel Serial Port Interface (McSPI)
Copyright © 2011–2013, Texas Instruments Incorporated