AvaLAN Wireless AW900mSPI-10 - Manual (Page 7)

PAGE 7 Technical support (650) 384-0000 www.avalanwireless.com
AW900mSPI User’s Manual
Here are the Signal definitions for the AW900SPI in SPI mode:
Pin Number Name Description
1 Vcc 3.3 vdc for XC1220
2 /CS_LED Chip select for LEDs and DIP switches (active low) C
3 /CS_PD Chip select for external programming device hip s
4 SCK0 Serial clock for LEDs and DIP switches
5 MISO0 Data in for LEDs and DIP switches
6 MOSI0 Data out for LEDs and DIP switches
7 GND XC1220 Ground
8 Error Flag 1=last command not understood. Clear with /CS_BB
9 Data Ready 1=data packet available, 0=no data
10 FIFO Full Flag 1=FIFO full, don’t send any more data, 0=FIFO is empty
11 Connected Flag 1=RF connection present, 0=RF searching/standby
12 /CS_BB Chip select for XC1220
13 SCK1 Serial clock for XC1220
14 MOSI1 Data out for XC1220
15 MISO1 Data in for XC1220
16 RFVcc 3.3 vdc for RF section
17 RFGND RF section ground
SPI0 uses mode (0,0) for clock phase and polarity. This means that the SCK0 line
idles low and data is setup on the falling edge of the clock and latched on the rising
edge. SPI1 uses mode (1,1), meaning that SCK1, MISO1 and MOSI1 are all idle high.
Data is still set up on the falling edge and latched on the rising edge of the clock.
The clock rate for the SPI0 interface is 1.5625 MHz. The maximum clock rate for
the SPI1 interface is 7 MHz and the minimum clock rate is 530 kHz (minimum clock
period of 143 ns and a maximum of 1887 ns).
CS
MISO b7 b6 b5 b4 b3 b2 b1 b0
MOSI b7 b6 b5 b4 b3 b2 b1 b0
SCK