Q2686 Wavecom, Q2686 Datasheet - Page 31

• Manufacturer Part Number: Q2686
• Description: Wireless CPU
• Manufacturer: Wavecom

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3.4 Serial Interface
The Q2686 Wireless CPU
either two SPI bus or an I²C 2-wire interface.
3.4.1 SPI Bus
Both SPI bus interfaces includes:
SPI bus characteristics:
3.4.1.1
Waveform for SPI transfer with 4-wire configuration in master mode 0 (chip
select is not represented).
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q2686_PTS_001-007
SPIx-I
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SPIx-IO
SPIx-CLK
A CLK signal
An I/O signal
An I signal
A CS signal complying with the standard SPI bus.
Master mode operation
SPI speed is from 101.5 Kbit/s to 13 Mbit/s in master mode operation
3 or 4-wire interface
SPI-mode configuration: 0 to 3
1 to 16 bits data length
SPI Waveforms
Figure 3: SPI Timing diagrams, Mode 0, Master, 4 wires
confidential ©
®
may be connected to an LCD module driver through
Data-
Data valid
OUTdelay
CLK-cycle
Data-
Q2686 Wireless CPU
IN-setup
Data valid
Data-
Interfaces
IN-hold
March 6, 2007
Page: 30 / 87
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