mrf89xa Microchip Technology Inc., mrf89xa Datasheet - Page 78

• Manufacturer Part Number: mrf89xa
• Description: Ultra-low Power, Integrated Ism Band Sub-ghz Transceiver
• Manufacturer: Microchip Technology Inc.

3.9
In Continuous mode, the NRZ data to/from the
modulator/demodulator is accessed by the host
microcontroller on the bidirectional DATA pin (pin 20).
The SPI Data, FIFO, and packet handler are therefore
inactive. Figure 3-17 illustrates the Continuous mode
of operation.
FIGURE 3-17:
FIGURE 3-18:
3.9.1
In TX mode, a synchronous data clock for a host
microcontroller is provided on the IRQ1 pin (pin 22). Its
timing with respect to the data is illustrated in
Figure 3-18. DATA is internally sampled on the rising
edge of DCLK so the microcontroller can change the
logic state anytime outside the setup/hold time zone.
The setup and hold times are shown in gray in the
Figure 3-18.
The use of DCLK is compulsory in FSK and optional in
OOK.
DS70622B-page 78
MRF89XA
DATA (NRZ)
Continuous Mode
Data
TX PROCESSING
DCLK
Datapath
TX/RX
RX
Recognition
CONTINUOUS MODE BLOCK DIAGRAM
TX PROCESSING IN CONTINUOUS MODE
SYNC
T_DATA
MRF89XA
T_DATA
Preliminary
Control
3.9.2
If the bit synchronizer is disabled, the raw demodulator
output is made directly available on the DATA pin and
no DCLK signal is provided.
Conversely, if the bit synchronizer is enabled, synchro-
nous cleaned data and clock are made available
respectively on the DATA and IRQ1 pins (pin 20 and
22). DATA is sampled on the rising edge of DCLK and
updated on the falling edge as shown in Figure 3-19.
RX PROCESSING
CONFIG
SPI
© 2010 Microchip Technology Inc.
CSCON
SDO
SCK
SDI
IRQ0
IRQ1 (DCLK)
DATA