FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 26-39
26.5.2.26 Slot Counter Channel B Register (SLTCTBR)
This register provides the number of the current slot in the current communication cycle for channel B.
26.5.2.27 Rate Correction Value Register (RTCORVR)
This register provides the sign extended rate correction value in microticks as it was calculated by the clock
synchronization algorithm. The controller updates this register during the NIT of each odd numbered
communication cycle.
Base + 0x0036
0123456789101112131415
R00000 SLOTCNTB
W
Reset0000000000000000
Figure 26-26. Slot Counter Channel B Register (SLTCTBR)
Table 26-32. SLTCTBR Field Descriptions
Field Description
SLOTCNTA Slot Counter Value for Channel B — protocol related variable: vSlotCounter for channel B
This field provides the number of the current slot in the current communication cycle.
Base + 0x0038 Additional Reset: RUN Command
0123456789101112131415
RRATECORR
W
Reset0000000000000000
Figure 26-27. Rate Correction Value Register (RTCORVR)
Table 26-33. RTCORVR Field Descriptions
Field Description
RATECORR Rate Correction Value — protocol related variable: vRateCorrection (before value limitation and external rate
correction).
This field provides the sign extended rate correction value in microticks as it was calculated by the clock
synchronization algorithm. The value is represented in 2’s complement format. This value does not include the
value limitation and the application of the external rate correction. If the magnitude of the internally calculated
rate correction value exceeds the limit given by rate_correction_out in the Protocol Configuration Register 13
(PCR13), the clock correction reached limit interrupt flag CCL_IF is set in the Protocol Interrupt Flag Register 0
(PIFR0).
Note: If the controller was not able to calculate a new rate correction term due to a lack of synchronization
frames, the RATECORR value is not updated.
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