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SX1211
WIRELESS & SENSING
5.4.5. uC Connections
SX1211
IRQ_0
IRQ_1
NSS_CONFIG
uC
NSS_DATA
SCK
MOSI
MISO
Figure 41: 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.
MISO: if no read register access is needed and the chip is used in Tx mode only. In this case, pull up to VDD
through a 100 k ? resistor.
In addition, DATA pin (unused in buffered mode) should be pulled-up to VDD through a 100 k ? resistor.
Please refer to Table 13 for the SX1211’s pin configuration.
5.4.6. 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.
Tx
Rx
Description
Data_mode_x
X
X
Defines data operation mode ( Buffered)
MCParam
IRQParam
Fifo_size
Fifo_thresh
Rx_stby_irq_0
Rx_stby_irq_1
Tx_irq_1
Fifo_fill_method
X
X
X
X
X
X
X
X
Defines FIFO size
Defines FIFO threshold
Defines IRQ_0 source in Rx & Stby modes
Defines IRQ_1 source in Rx & Stby modes
Defines IRQ_1 source in Tx mode
Defines FIFO filling method
Fifo_fill
Tx_start_irq_0
X
X
Controls FIFO filling status
Defines Tx start condition and IRQ_0 source
RXParam
SYNCParam
Sync_size
Sync_tol
Sync_value
X
X
X
Defines Sync word size
Defines the error tolerance on Sync word detection
Defines Sync word value
Table 22: Relevant Configuration Registers in Buffered Mode (data processing related only)
Tx Mode:
Program Tx start condition and IRQs: Start Tx when FIFO is not empty (Tx_start_irq_0=1) and IRQ_1 mapped
to Tx_done (Tx_irq_1=1)
Go to Tx mode (and wait for Tx to be ready, see Figure 50)
Rev 8 – February 2013
Page 47 of 92
www.semtech.com
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