Texas Instruments AFE79 Series - 2.16.321 Register 4 A0 h (offset = 4 A0 h) [reset = 1 h]; 2.16.322 Register 4 A3 h (offset = 4 A3 h) [reset = 0 h]; 2.16.323 Register 4 A4 h (offset = 4 A4 h) [reset = 1 h]

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Serial Interface Register Maps
2.16.321 Register 4A0h (offset = 4A0h) [reset = 1h]
Figure 2-2584. Register 4A0h
7 6 5 4 3 2 1 0
reserved reserved BUF_DIR_CTRL_GPIO_40
R/W-0h R/W-0h R/W-1h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2600. Register 4A0 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_40
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
2.16.322 Register 4A3h (offset = 4A3h) [reset = 0h]
Figure 2-2585. Register 4A3h
7 6 5 4 3 2 1 0
ACTIV_BIR_DIR_CTRL_GPIO_40 reserved
R/W-0h R/W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2601. Register 4A3 Field Descriptions
Bit Field Type Reset Description
3-1
ACTIV_BIR_DIR_C
TRL_GPIO_40
R/W 0h
Control to indicate whether the GPIO_40 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
2.16.323 Register 4A4h (offset = 4A4h) [reset = 1h]
Figure 2-2586. Register 4A4h
7 6 5 4 3 2 1 0
reserved reserved BUF_DIR_CTRL_GPIO_41
R/W-0h R/W-0h R/W-1h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-2602. Register 4A4 Field Descriptions
Bit Field Type Reset Description
7-5 reserved R/W 0h
4-2 reserved R/W 0h