Silicon Laboratories Si47 Series Programming Manual page 145

Command 0x81. GPIO_SET
Sets the output level (high or low) for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output by setting the
GPO1OEN, GPO2OEN, and GPO3OEN bit in the GPIO_CTL command. To avoid excessive current consumption
due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set
when it is safe to send the next command. This property may only be set or read when in powerup mode. The
default is all GPO pins set for high impedance.
Note: GPIO_SET is supported in AM_SW_LW component 2.0 or later.
Available in: All
Command arguments: One
Response bytes: None
Command
Bit D7
1
CMD
0
ARG1
ARG Bit
1 7:4
1 3 GPO3LEVEL
1 2 GPO2LEVEL
1 1 GPO1LEVEL
1 0
Response
Bit D7
CTS
STATUS
D6 D5 D4
0 0 0
0 0 0
Name
Reserved Always write 0.
GPO3 Output Level.
0 = Output low (default).
1 = Output high.
GPO2 Output Level.
0 = Output low (default).
1 = Output high.
GPO1 Output Level.
0 = Output low (default).
1 = Output high.
Reserved Always write 0.
D6 D5
ERR X
D3 D2
0 0
GPO3LEVEL GPO2LEVEL
Function
D4 D3
X X RDSINT
Rev. 0.8
AN332
D1
0
GPO1LEVEL
D2 D1
ASQINT STCINT
D0
1
0
D0
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