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SX1210
ADVANCED COMMUNICATIONS & SENSING
5.4.4. uC Connections
SX1210
IRQ_0
IRQ_1
NSS_CONFIG
uC
NSS_DATA
SCK
MOSI
MISO
Figure 32: uC Connections in Buffered Mode
Note that depending upon the application, some uC connections may not be needed:
IRQ_0: if none of the relevant IRQ sources are used. In this case, leave floating.
IRQ_1: if none of the relevant IRQ sources are used. In this case, leave floating.
In addition, DATA pin (unused in buffered mode) should be pulled-up to VDD through a 100 k ? resistor.
Please refer to Table 11 for the SX1210’s pin configuration.
5.4.5. Buffered Mode Example
Configure all data processing related registers listed below appropriately. In this example we assume Sync
word recognition is on and Fifo_fill_method=0.
Description
Data_mode_x
Defines data operation mode ( Buffered)
MCParam
IRQParam
RXParam
SYNCParam
Fifo_size
Fifo_thresh
Rx_stby_irq_0
Rx_stby_irq_1
Fifo_fill_method
Fifo_fill
Sync_size
Sync_tol
Sync_value
Defines FIFO size
Defines FIFO threshold
Defines IRQ_0 source in Rx & Stby modes
Defines IRQ_1 source in Rx & Stby modes
Defines FIFO filling method
Controls FIFO filling status
Defines Sync word size
Defines the error tolerance on Sync word detection
Defines Sync word value
Table 18: Relevant Configuration Registers in Buffered Mode (data processing related only)
Program Rx/Stby interrupts: IRQ_0 mapped to /Fifoempty (Rx_stby_irq_0=10) and IRQ_1 mapped to
Fifo_threshold (Rx_stby_irq_1=01). Configure Fifo_thresh to an appropriate value (ex: to detect packet end if
its length is known)
Go to Rx mode (note that Rx is not ready immediately, Cf section 7.3.1).
Wait for Fifo_threshold interrupt (i.e. Sync word has been detected and FIFO filled up to the defined threshold).
If it is packet end, go to Stby (SR’s content is lost).
Read packet bytes from FIFO until /Fifoempty goes low (or correct number of bytes is read).
Go to Sleep mode.
Rev 2– Sept 8 , 2008
th
Page 40 of 73
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