MEC1322 Datasheet, PDF (417/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

38.17 Serial Peripheral Interface (SPI) Timings
FIGURE 38-24: SPI CLOCK TIMING
MEC1322
SPICLK
Tr
Tf
Th
Tl
Tp
TABLE 38-22: SPI CLOCK TIMING PARAMETERS
NAME
DESCRIPTION
MIN
TYP
MAX
UNITS
Tr
SPI Clock Rise Time. Measured
from 10% to 90%.
10% of SPCLK ns
Period
Tf
SPI Clock Fall Time. Measured
from 90% to 10%.
10% of SPCLK ns
Period
Th/Tl
SPI Clock High Time/SPI Clock 40% of SPCLK 50% of SPCLK 60% of SPCLK ns
Low Time
Period
Period
Period
Tp
SPI Clock Period – As selected 20.8 (Note 38-
by SPI Clock Generator Register 14)
62492.25
ns
Note 38-14 This timing value applies when the 48MHz ring oscillator is at its 48MHz operating frequency (with
32 kHz present after frequency lock to 48MHz).
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DS00001719D-page 417