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MRF89XA
3.9.4
HOST MICROCONTROLLER
TX Mode:
INTERFACE/REQUIRED
CONNECTIONS
Note that some connections may not be needed
depending on the application:
? IRQ0: If Sync and RSSI interrupts are not used,
leave the pin floating.
1.
2.
3.
Go to TX mode (and wait for TX to be ready, see
Figure 5-3 ).
Send all packet bits on the DATA pin
synchronously with the DCLK signal provided
on IRQ1.
Go to Sleep mode.
? IRQ1: If the device is never used in TX FSK mode
(DCLK connection is not compulsory in RX and
TX OOK modes), leave the pin floating.
? SDO: If no read register access is needed, pull-up
to V DD through a 100 k ? resistor.
Note: The CSDAT pin (pin15), which is unused
in Continuous mode, should be pulled-up
to V DD through a 100 k ? resistor.
Table 2-4 , details the MRF89XA pin con-
figuration and chip mode.
RX Mode:
1. Program RX interrupts: IRQ0 mapped to Sync
(IRQ0RXS<1:0> = 00 ) and IRQ1 mapped to
DCLK (Bit synchronizer enabled).
2. Go to RX mode (note that RX is not ready
immediately, see Figure 5-2 ).
3. Wait for Sync interrupt.
4. Get all packet bits on the DATA pin
synchronously with the DCLK signal provided
on IRQ1.
5. Go to Sleep mode.
FIGURE 3-20:
HOST MCU
3.9.6
CONTINUOUS MODE REGISTERS
CONNECTIONS IN
CONTINUOUS MODE
The registers associated with Continuous mode are:
? GCONREG ( Register 2-1 )
MRF89XA
DATA
?
?
?
DMODREG ( Register 2-2 )
FDEVREG ( Register 2-3 )
BRSREG ( Register 2-4 )
IRQ0
IRQ1 (DCLK)
CSCON
SCK
SDI
SDO
PIC ?
Microcontroller
?
?
?
?
?
?
?
?
FLTHREG ( Register 2-5 )
FIFOCREG ( Register 2-6 )
FTXRXIREG ( Register 2-14 )
FTPRIREG ( Register 2-15 )
RSTHIREG ( Register 2-16 )
FILCREG ( Register 2-17 )
PFCREG ( Register 2-18 )
SYNCREG ( Register 2-19 )
3.9.5 CONTINUOUS MODE EXAMPLE
The data processing related registers are appropriately
configured as listed Table 3-7 . In this example we
assume that both the Bit synchronizer and Sync word
recognition are on.
?
?
?
?
?
?
RSTSREG ( Register 2-21 )
OOKCREG ( Register 2-22 )
SYNCV31REG ( Register 2-23 )
SYNCV23REG ( Register 2-24 )
SYNCV15REG ( Register 2-25 )
SYNCV07REG ( Register 2-26 )
TABLE 3-7:
CONFIGURATION REGISTERS RELATED TO DATA PROCESSING (ONLY) IN
CONTINUOUS MODE
Register Name
Register Bits
TX
RX
Description
DMODREG
DMODE0, DMODE1
X
X
Defines data operation mode (
Continuous)
FTXRXIREG
SYNCREG
SYNCREG
SYNCREG
SYNCV31REG
SYNCV23REG
SYNCV15REG
SYNCV07REG
IRQ0RXS<1:0>
SYNCREN
SYNCWSZ<1:0>
SYNCTEN<1:0>
SYNCV<31:24>
SYNCV<23:16>
SYNCV<15:8>
SYNCV<7:0>
X
X
X
X
X
X
X
X
Defines IRQ0 source in RX mode
Enables Sync word recognition
Defines Sync word size
Defines the error tolerance on Sync word recognition
Defines Sync word value
Defines Sync word value
Defines Sync word value
Defines Sync word value
DS70622C-page 76
Preliminary
? 2010–2011 Microchip Technology Inc.
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