Maxim Integrated MAX32665 - Table 8-27. SPIXR Transmit Packet Size Register; Table 8-28. SPIXR Static Configuration Register

MAX32665-MAX32668 User Guide
Maxim Integrated Page 170 of 457
SPIXR Master Signals Control Register
SPIXR_CTRL1
[0x0004]
Bits
Name
Access
Reset
Description
4
ss_io
R/W
0
Master Slave Select Signal Direction
This field must be set to 0 for SPIXR operation.
0: Slave Select is an output
Note: The SPIXR only operates as a SPI master in single master mode. Writing 1
to this field is invalid.
3:2
-
R/W
0
Reserved for Future Use
Do not modify this field.
1
master
R/W
0
SPIXR Master Mode Enable
This field must be set to 1 to use the SPIXR peripheral.
1: Master Mode
Note: The SPIXR peripheral only operates in Master Mode. Writing 0 to this field
is invalid.
0
enable
R/W
0
SPIXR Enable/Disable
Set this field to 1 to enable the SPIXR peripheral.
0: SPIXR is disabled.
1: SPIXR is enabled.
Note: Setting this field to 0 disables the SPIXR but maintains all registers and the
FIFO data.
Table 8-27. SPIXR Transmit Packet Size Register
SPIXR Transmit Packet Size Register
SPIXR_CTRL2
[0x0008]
Bits
Name
Access
Reset
Description
31:16
rx_num_char
R/W
0
Number of characters to receive in RX FIFO
The number of characters in the RX FIFO.
Note: This field is only used if the SPIXR is configured for Three-Wire SPI
operation, SPIXR_CTRL3.three_wire = 1.
15:0
tx_num_char
R/W
0
Number of characters to transmit from TX FIFO
The number of characters in the TX FIFO.
Note: If the SPIXR is set to Four-wire mode, SPIXR_CTRL3.three_wire = 0, this
field represents both the RX and TX FIFO character count.
Table 8-28. SPIXR Static Configuration Register
SPIXR Static Configuration Register
SPIXR_CTRL3
[0x000C]
Bits
Name
Access
Reset
Description
31:17
-
R/W
0
Reserved for Future Use
Do not modify this field.
16
sspol
R/W
0
Slave Select Polarity
0: SS is active low
1: SS is active high
15
three_wire
R/W
0
Three-Wire Mode Enable
0: Four-wire mode enabled (Single Mode only)
1: Three-wire mode enabled