xe1202 ETC-unknow, xe1202 Datasheet - Page 22

• Manufacturer Part Number: xe1202
• Description: Low-power, Integrated Uhf Transceiver
• Manufacturer: ETC-unknow

5.7 Clock Output Interface
CLKOUT is a clock signal at 1.22, 2.44, 4.87, or 9.75 MHz, depending on programming. When the XE1202 is in
Sleep Mode (MODE[2:0] = 000) or when “RTParam_Clkout” is low, this clock is stopped.
5.8 Default settings at power-up
Upon power-up all , RTParam, FSParam, ADParam and Pattern registers are set to 00hex .
At power-up, XE1202 is in Stand-by mode, which means that the Xtal oscillator is running; furthermore, the signal
at 1.22 MHz
RTParam_Clkout is low, which means that, if nothing is changed in the configuration register, the signal on
CLKOUT will disappear at the first rising edge of EN; furthermore, at this first rising edge of EN, the circuit will be
put in the mode corresponding to the signals on pins MODE(2:0) at this moment. Thus, to keep the circuit in
Standy-by mode and the clock signal present on CLKOUT, RTParam_Clkout has to be set high during the first
communication through the 3-wire bus, and the MODE(0) has to be set high before the first rising edge of EN.
It is strongly recommended to initialize the XE1202 registers right after power-up according to the application
needs.
22
(reference frequency divided by 32) is present on pin CLKOUT. However, internally,
Data Sheet
XE1202
D0211-105