Microcontroller Interface
Figure 2. Crystal Pulling Configurations
5
Microcontroller Interface
Four digital input pins (ENABLE, DATA, BAND, and MODE) enable the circuit to be controlled by a microcontroller. The
band frequency and the modulation type should be configured before enabling the circuit.
One digital output pin, DATACLK, provides the microcontroller with a reference frequency for data clocking. This frequency
is equal to the crystal oscillator frequency divided by 64 (see Table 4 ).
Table 4. DATACLK Frequency vs Crystal Oscillator Frequency
Crystal Oscillator Frequency (MHz)
9.84
13.56
DATACLK Frequency (kHz)
154
212
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Freescale Semiconductor
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