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5. M is the number of clock cycles added to time between SCK negation and PCS negation and is software programmable
using DSPI_CTARx[PASC] and DSPI_CTARx[ASC]. The minimum value is 2 cycles unless TSB mode or Continuous SCK
clock mode is selected, in which case, M is automatically set to 0 clock cycles (PCS and SCK are driven by the same edge
of DSPI_CLKn).
6. t
SDC
is only valid for even divide ratios. For odd divide ratios the fundamental duty cycle is not 50:50. For these odd divide
ratios cases, the absolute spec number is applied as jitter/uncertainty to the nominal high time and low time.
7. PCSx and PCSS using same pad configuration.
8. Input timing assumes an input slew rate of 1 ns (10% - 90%) and uses TTL voltage thresholds.
9. SOUT Data Valid and Data hold are independent of load capacitance if SCK and SOUT load capacitances are the same
value.
Data
Data
Last Data
First Data
First Data
Last Data
SIN
SOUT
SCK Output
SCK Output
SCK Output
(CPOL = 0)
PCSx
(CPOL = 1)
t
SCK
t
SDC
t
SDC
CSC
t
t
ASC
t
t
SUI
HI
t
SUO
t
HO
Figure 30. DSPI CMOS master mode – classic timing, CPHA = 0
AC specifications
SPC5746R Microcontroller Data Sheet, Rev. 6, 06/2017
68
NXP Semiconductors