SLAZ451Z May   2014  – August 2021 MSP430FR5847

 

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6.40 TB25

TB Module

Category

Functional

Function

In up mode, TBxCCRn value is immediately transferred to TBxCLn when TBxCCTLn.CLLD bits are set or 0x01 or 0x10

Description

IF Timer B is configured for Up mode,
AND
the compare latch load event (TBxCCTLn.CLLD bits) setting is configured to update TBxCCRn  when TBxR reaches 0,
THEN
TBxCCRn will update immediately instead of the described condition.

This is contrary to the user guide description of  TBxCCTLn.CLLD = 0x01 or 0x10 modes.

Workaround

If user needs to update TBxCCRn value when TBxR counts to 0 in Timer B up mode:

1. Set TBxCCTLn. CLLD = 0x00
2. Enable the Timer B interrupt (TBIE) in TBxCTL
3. Update TBxCCRn value within interrupt routine.

Timer B Interrupt would need to be serviced in a timely manner to mitigate disruption or unintended timer output if an output mode is used.