Timer Details: Configuring TIMER_A
EQU
Before we examine OutputMode 2, let’s consider the nomenclature used in the MSP430 User’s
Guide.
Apparently, there is an EQU (equate) signal inside the timer for each CCR. For example, the
equate signal for CCR1 would be called EQU1. While these EQU values cannot be read directly
from any of the timer control registers, the documentation makes use of them to describe when a
comparison becomes true.
Therefore, when the timer counter (TAR) becomes equal to a compare register (CCR), the
associated EQU signal becomes true.
This can be seen in the following diagram captured from the TIMER_A documentation. Notice
how EQU0 becomes true when TAR=CCR0; likewise, EQU1 becomes true when TAR=CCR1.
MSP430 Workshop - Timers 6 - 25
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