PNI MicroMag - Manual (Page 20)

PNI Sensor Corporation DOC# 1015175 r01
MicroMag User Manual – March 2010 Page 20 of 23
Figure 5-1: SPI Port Full Timing Sequence
When implementing an SPI port, whether it is a dedicated hardware peripheral port
or a software implemented port using general purpose I/O (also known as bit-banging)
the timing parameters given in Figure 5-2 must be met to ensure reliable
communications. Data is always considered valid while SCLK is HIGH (tDASH = Time,
Data After SCLK High). When SCLK is LOW, data is in transition (tDBSH = Time, Data
Before SCLK High).The clock set-up and hold times, t
DBSH
and t
DASH
must be greater
than 100 ns.
Figure 5-2: SPI Port Timing Parameters