M16C6NL Datasheet, PDF (358/388 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NL, M16C/6NN)
23. Usage Precaution
23.11 Thee-Phase Motor Control Timer Function
If there is a possibility that you may write data to TAi-1 register (i = 1, 2, 4) near Timer B2 overflow, read the
value of TB2 register, verify that there is sufficient time until Timer B2 overflows, before doing an immediate
write to TAi-1 register.
In order to shorten the period from reading TB2 register to writing data to TAi-1 register, ensure that no
interrupt will be processed during this period.
If there is not enough time till Timer B2 overflows, only write to TAi-1 register after Timer B2 overflowed.
Rev.2.00 Nov 28, 2005 page 342 of 364
REJ09B0126-0200