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MRF49XA
The device transmit sequence should be performed as
follows:
1. Enable the TX register by setting TXDEN = 1.
2. The TX register is automatically filled with
0xAAAA, which can be used to generate
preamble.
3. Enable the transmitter by setting TXCEN = 1 .
4. The synthesizer and the PLL turns on, calibrates
itself and the PA is automatically enabled.
5. The TX data transmission starts.
6. On completion of byte transmission, the IRO pin
goes high and the SDO pin goes low
simultaneously. The IRO pulse shows that the
first 8 bits (the first byte by default, 0xAA) have
been transmitted. There are still 8 bits in the
transmit register.
7. The microcontroller recognizes the interrupt and
writes a data byte to the TXBREG.
The transmit sequence is illustrated in Figure 3-16 . For
details on transmit pin function configuration, see
Table 3-3 . The TXDEN bit is in the GENCREG register
and enables the Transmit Data register.
The transmit sequence can be performed without
sending a dummy byte (step 1), but after loading the
last data byte to the transmit register, the PA turn off
should be delayed for at least 16 bits time. The
microcontroller clock source (if the clock is not supplied
by the transceiver) should be stable enough over
temperature and voltage ranges to ensure this
minimum delay under all operating circumstances.
When the dummy byte is used, the whole process is
driven by interrupts. Changing the TX data rate has no
effect on the algorithm and no accurate delay
measurement is needed. Figure 3-17 shows the
multi-byte transmit write sequence.
The registers associated with transmission are:
8. Repeat steps 6 and 7 until the last data byte is
reached.
9. Using the same method, transmit a dummy byte.
The value of this dummy byte can be anything.
10. The next high-to-low transition on the IRO line
(or low-to-high on the SDO pin) shows that the
transmission of the data bytes has ended. The
dummy byte is still in the TX latch.
11. Turn off the transmitter by setting the bit,
TXCEN = 0 . This event probably happens while
the dummy byte is being transmitted. Since the
dummy byte contains no useful information, this
corruption will not cause any problem.
12. Clearing the TXDEN bit clears the register
underrun interrupt. The IRO pin goes high and
the SDO pin goes low.
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STSREG (see Register 2-1 )
GENCREG (see Register 2-2 )
TXCREG (see Register 2-4 )
TXBREG (see Register 2-5 )
PMCREG (see Register 2-13 )
TABLE 3-3:
TRANSMIT PIN FUNCTION VS . OPERATION MODE
Mode
Transmit
Bit Setting
TXDEN = 0
TXDEN = 1
Function
Internal TX Data register disabled
Internal TX Data register enabled
Pin 6
TX data input
FSEL input
Pin 7
Not used
(TX Data register can be
accessed)
DS70590C-page 68
Preliminary
? 2009-2011 Microchip Technology Inc.
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