SE873 Family Product User Guide
Electrical Interface
1VV0301216
Rev.4
Page 38 of 69
2018-08-24
Serial I/O Ports - Configuration and Operation
The receiver module includes two full-duplex serial ports which are configurable for the desired
interface.
Primary Serial Port Configuration
The primary port is configured for UART, I
2
C or SPI interface via reading GPIO6 and GPIO7 pins
at startup or reset (only).
Pin
Pullup /
Pulldown
UART
I
2
C
(
MULTI
-
MASTER
)
SPI
(slave)
GPIO6
Weak
internal
pulldown
Pullup
10 kΩ to +1.8 V
(may become CTS)
Float
Float
(becomes SCLK)
GPIO7
Weak
internal
pullup
Float
(may become RTS)
Pulldown
10 kΩ to ground
Float
(becomes SPI_CS)
Table 8-9 Primary Serial Port Configuration
Note
: GPIO6 and GPIO7 are read for configuration purposes only at power up or reset.
Afterwards, they may be used for UART or SPI signal lines depending on firmware options.
Secondary Serial Port Configuration
The secondary port is configured by the firmware build. It is disabled by default.
Note: SPI is not available because it requires 4 pins.
Summary of Contents for SE873 Series
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