RFM02 Datasheet, PDF (14/24 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transmitter

RFM02
after S periods of the microcontroller clock (if a1=1 and ex=0) to enable the microcontroller to execute all
necessary commands before entering sleep mode itself. The 8-bit value S is determined by bits <s7:s0>.
8. Wake-Up Timer Command
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 POR
1 1 1 r4 r3 r2 r1 r0 m7 m6 m5 m4 m3 m2 m1 m0 E000h
The wake-up time period can be calculated as:
Twake-up = M * 2^R [ms],
where M is defined by the <m7 : m0> digital value and R is defined by the <r4 : r0> digital value.
Note:
• For continual operation the et bit should be cleared and set at the end of every cycle.
9. Data Transmit Command
bit 7 6 5 4 3 2 1 0
11000110
This Command Indicates that the following bitstream coming in via the serial interface is to be
transmitted.
Note
• This command is not needed if the transmitters’ power management bits (ex, es and ea) are fully
controlled by the microcontroller and TX data comes through the FSK pin.
• If the crystal oscillator was formerly switched off (ex=0), the internal oscillator needs tsx time, to
switch on. The actual value depends on the type of quartz crystal used.
• If the synthesizer was formerly switched off (es=0), the internal PLL needs tsp startup time. Valid data
can be transmitted only when the internal locking process is finished.
Data Transmit Sequence Through the FSK Pin
Tel: [phone] Fax: [phone] E-mail: [e-mail] http://www.hoperf.com