Texas Instruments AFE79 Series - 2.16.281 Register 450 h (offset = 450 h) [reset = 1 h]; 2.16.282 Register 453 h (offset = 453 h) [reset = 0 h]; 2.16.283 Register 454 h (offset = 454 h) [reset = 1 h]

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SBAU337–May 2020
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Serial Interface Register Maps
2.16.281 Register 450h (offset = 450h) [reset = 1h]
Figure 2-2544. Register 450h
7 6 5 4 3 2 1 0
reserved reserved BUF_DIR_CTRL_GPIO_20
R/W-0h R/W-0h R/W-1h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2560. Register 450 Field Descriptions
Bit Field Type Reset Description
7-5 reserved R/W 0h
4-2 reserved R/W 0h
1-0
BUF_DIR_CTRL_G
PIO_20
R/W 1h
Controls the direction of GPIO
0 both input and output are not selected.. can be used for
analog
1 input mode
2 output mode
3 shouldnt be used
2.16.282 Register 453h (offset = 453h) [reset = 0h]
Figure 2-2545. Register 453h
7 6 5 4 3 2 1 0
ACTIV_BIR_DIR_CTRL_GPIO_20 reserved
R/W-0h R/W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2561. Register 453 Field Descriptions
Bit Field Type Reset Description
3-1
ACTIV_BIR_DIR_C
TRL_GPIO_20
R/W 0h
Control to indicate whether the GPIO_20 needs dynamic
ouptu t enabling.
0 to 3 --> Static direction
4 --> Use the IO for 3 pin SPI B2 SDIO.
5 --> Use the IO for 4 pin SPI B2 SDO
6 --> Use the IO for 3 pin SPI B1 SDIO.
7 --> use the IO for 4 pin SPI B1 SDO.
0-0 reserved R/W 0h
2.16.283 Register 454h (offset = 454h) [reset = 1h]
Figure 2-2546. Register 454h
7 6 5 4 3 2 1 0
reserved reserved BUF_DIR_CTRL_GPIO_21
R/W-0h R/W-0h R/W-1h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2562. Register 454 Field Descriptions
Bit Field Type Reset Description
7-5 reserved R/W 0h
4-2 reserved R/W 0h