MC68HC908RF2 Datasheet, PDF (225/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

PLL Tuned UHF Transmitter Module
Microcontroller Interfaces
This crystal pulling solution implies that the RF output frequency
deviation equals the crystal frequency deviation multipled by the PLL
divider ratio (see Table 16-1).
16.7 Microcontroller Interfaces
Four digital input pins (ENABLE, DATA, BAND, and MODE) enable the
circuit to be controlled by a microcontroller. It is recommended to
configure the band frequency and the modulation type before enabling
the circuit. In a typical application the input pins BAND and MODE are
hardwired.
One digital output (DATACLK) provides the microcontroller a reference
frequency for data clocking. This frequency is equal to the crystal
oscillator frequency divided by 64 (see Table 16-2).
Table 16-2. DATACLK Frequency
versus Crystal Oscillator Frequency
Crystal Oscillator Frequency
(MHz)
9.84
13.56
DATACLK Frequency
(kHz)
154
212
16.8 State Machine
Figure 16-2 details the main state machine.
MC68HC908RF2 — Rev. 1
MOTOROLA
PLL Tuned UHF Transmitter Module
Advance Information
225