WI.232FHSS-250-R Radiotronix, WI.232FHSS-250-R Datasheet - Page 57

• Manufacturer Part Number: WI.232FHSS-250-R
• Description: RF Modules & Development Tools 900MHz FHSS Low
• Manufacturer: Radiotronix

Specifications of WI.232FHSS-250-R

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: WI232FHSS-250-R

WI.232FHSS-25-R/ WI.232FHSS-250-R DATASHEET
5. Using Configuration Registers
5.1. CMD Pin
The CMD pin is used to inform the module where incoming UART information should be routed. When the
CMD pin is high or left floating, all incoming UART information is treated as payload data and transferred
over the wireless interface. If the CMD pin is low, the incoming UART data is routed to the command
parser for processing. Since the module’s processor looks at UART data one byte at a time, the CMD line
must be held low for the entire duration of the command plus a 20μs margin for processing. Leaving the
CMD pin low for additional time (for example, until the ACK byte is received by your application) will not
adversely affect the module. If RF packets are received while the CMD line is active, they are still
processed and presented to the module’s UART for transmission.
The CMD pin is also used during the module startup process to determine whether or not to reload the
non-volatile registers with factory defaults. The module startup or boot process is executed when the
module is powered on from a power off state, or is issued a software or hardware reset. When the module
goes through this boot process, it checks the state of the CMD pin. If it is low, the module will clear the
non-volatile registers and re-populate them with factory default values. Possible reset sources that could
cause the module to reboot are power supply brown-out, power supply instability, noise present on
C2CK/RST pin, noise/voltage spikes on digital I/O pins, issuing a reset command through the command
interface, and toggling the C2CK/RST pin when not in deep sleep.
Figure 15: Command and CMD Pin Timing
5.2. CMD_RSP Pin
The CMD_RSP pin can be used to determine whether the outbound UART traffic is actual data or a
response from the command interpreter. This pin is normally high. When the module responds to a serial
command, such as a register read or write, the pin is pulled low for the duration of the outbound command
response. Monitoring of this pin is optional. It should be tied to a CMOS input or left floating.
5.3. Command Formatting
The Wi.232FHSS module contains several volatile and non-volatile registers that control its configuration
and operation. The volatile registers all have a non-volatile mirror register that is used to determine the
56
Chapter
5
Revision 1.1.0