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MRF89XA Datasheet(PDF) 76 Page - Microchip Technology |
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MRF89XA Datasheet(HTML) 76 Page - Microchip Technology |
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76 / 140 page  MRF89XA DS70000622D-page 76 Preliminary 2010-2017 Microchip Technology Inc. 3.9.4 HOST MICROCONTROLLER 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. • 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 VDD through a 100 kΩ resistor. FIGURE 3-20: HOST MCU CONNECTIONS IN CONTINUOUS MODE 3.9.5 CONTINUOUS MODE EXAMPLE The data processing related registers are appropriately configured as listed in Table 3-7. In this example, we assume that both the Bit synchronizer and Sync Word recognition are on. TX Mode: 1. Go to TX mode (and wait for TX to be ready, see Figure 5-3). 2. Send all packet bits on the DATA pin synchronously with the DCLK signal provided on IRQ1. 3. Go to Sleep 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 to be in sync with the DCLK signal provided on IRQ1. 5. Go to Sleep mode. 3.9.6 CONTINUOUS MODE REGISTERS The registers associated with Continuous mode are: • GCONREG (Register 2-1) •DMODREG (Register 2-2) •FDEVREG (Register 2-3) • BRSREG (Register 2-4) •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) • 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 Note: The CSDAT pin (pin15), which is unused in Continuous mode, should be pulled up to VDD through a 100 kΩ resistor. Table 2-4 details the MRF89XA pin config- uration and chip mode. PIC® MRF89XA IRQ0 IRQ1 (DCLK) DATA CSCON SCK SDI SDO Microcontroller Register Name Register Bits TX RX Description DMODREG DMODE0, DMODE1 X X Defines data operation mode ( Continuous) FTXRXIREG IRQ0RXS<1:0> X Defines IRQ0 source in RX mode SYNCREG SYNCREN X Enables Sync Word recognition SYNCREG SYNCWSZ<1:0> X Defines Sync Word size SYNCREG SYNCTEN<1:0> X Defines the error tolerance on Sync Word recognition SYNCV31REG SYNCV<31:24> X Defines Sync Word value SYNCV23REG SYNCV<23:16> X Defines Sync Word value SYNCV15REG SYNCV<15:8> X Defines Sync Word value SYNCV07REG SYNCV<7:0> X Defines Sync Word value |
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