Maxim Integrated MAX32665 - Table 8-31. SPIXR DMA Control Register

MAX32665-MAX32668 User Guide
Maxim Integrated Page 173 of 457
SPIXR Master Baud Rate Generator Register
SPIXR_BRG_CTRL
[0x0014]
Bits
Name
Access
Reset
Description
7:0
lo
R/W
0
SCK Low Clock Cycles Control
Setting this field to 0 disables the low duty cycle control for SCK.
Setting this field to any non-zero value sets the high cycle time to:
  
Note: If SPIXR_BRG_CTRL.scale = 0, SPIXR_BRG_CTRL.hi = 0, and
SPIXR_BRG_CTRL.lo = 0, character sizes of 2 and 10 bits are not supported.
Table 8-31. SPIXR DMA Control Register
SPIXR DMA Control Register
SPIXR_DMA
[0x001C]
Bits
Name
Access
Reset
Description
31
rx_dma_en
R/W
0
RX DMA Enable
Enable or disable the RX DMA.
0: RX DMA is disabled. Any pending DMA requests are cleared
1: RX DMA is enabled
30
-
R/W
0
Reserved for Future Use
Do not modify this field.
29:24
rx_fifo_cnt
RO
0
Number of Bytes in the RX FIFO
Reading this field returns the number of bytes currently in the RX FIFO
23
rx_fifo_clear
R/W1O
0
Clear the RX FIFO
Set this field to clear the RX FIFO and all related RX FIFO flags in the
SPIXR_INT_FL register. When cleared, the SPIXR_INT_FL.rx_fifo_empty flag is set
by hardware.
1: Clear the RX FIFO and any pending RX FIFO flags in SPIXR_INT_FL. This
should be done when the RX FIFO is inactive.
Note: Writing 0 has no effect.
22
rx_fifo_en
R/W
0
RX FIFO Enabled
Set this field to 1 to enable the RX FIFO.
0: RX FIFO disabled
1: RX FIFO enabled
21
-
R/W
0
Reserved for Future Use
Do not modify this field.
20:16
rx_fifo_level
R/W
0
RX FIFO Threshold Level
When the RX FIFO has more than this field, a DMA request is triggered, and the
SPIXR_INT_FL.rx_level interrupt flag is set. Valid values are 0x00 to 0x1E.
0x1F is not a valid value.
15
tx_dma_en
R/W
0
TX DMA Enable
0: TX DMA is disabled. Any pending DMA requests are cleared.
1: TX DMA is enabled
14
-
R/W
0
Reserved for Future Use
Do not modify this field.
13:8
tx_fifo_cnt
RO
0
Number of Bytes in the TX FIFO
Read returns the number of bytes currently in the TX FIFO