XE1202I027 Просмотр технического описания (PDF) - Unspecified

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производитель

XE1202I027

433MHz / 868MHz / 915MHz Low-power, integrated UHF transceiver

Unspecified 

Data Sheet

XE1202

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 (reference frequency divided by 32) is present on pin CLKOUT. However, internally,

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

D0211-105

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