IP2022 User’s Manual—Peripherals www.ubicom.com 257 PWM mode, the 16-bit number latched into the internal compare
register by writing to the TxCMP1H register does not take effect
until the end of the current PWM cycle. Reading   the   TxCMP1H   or   TxCMP1L   registers   returns   the
previously written value whether or not the value stored in these
registers has been transferred to the internal compare register by
writing to the TxCMP1H register. 4.4.6 TxCAP2H/TxCAP2L or TxCMP2H/TxCMP2L Register This register may be called the TxCAP2H/TxCAP2L register or the
TxCMP2H/TxCMP2L register. In PWM mode, this register determines the period of  the PWM
signal. In this mode, this register is both readable and writeable.
However, on writes the value is not applied until the end of the
current PWM cycle. Writing to the TxCAP2L register causes the value to be stored in
the TxCAP2L register with no other effect. Writing to the TxCAP2H
register causes an internal compare register to be loaded with a
16-bit  value  in  which  the  low  8  bits  come  from  the  TxCAP2L
register and the high 8 bits come from the value being written to
the   TxCAP2H   register.   Software   should   write   the   TxCAP2L
register before writing the TxCAP2H register, because writing to
the TxCAP2H register is used as an indication that a new compare
value  has   been  written.  Writing  to  the  TxCAP2H   register   is
required for the new compare value to take effect. In PWM mode,
the 16-bit  number  latched  into  the  internal  compare register  by