Texas Instruments MSP430x1xx - Manual (Page 177)

11-1
Timer_B
Timer_B
This section describes the basic functions of the MSP430 general-purpose
16-bit Timer_B. Timer_B implementation differs among MSP430 devices.
Always check the device’s data sheet to determine the connections and the
number of identical capture/compare registers. Also, the data sheets use
additional nomenclature to indicate the number of capture/compare registers
implemented for a specific device. For example, if
Timer_B3 is discussed in
a data sheet, then that device’s implementation of Timer_B contains 3
capture/compare registers.
In its default condition, Timer_B operates identically to Timer_A, except the
SCCI bit is not implemented on Timer_B.
Note:
Throughout this chapter, the word count is used in the text. As used in these
instances, it refers to the literal act of counting. It means that the counter must
be in the process of counting for the action to take place. If a particular value
is directly written to the counter, then the associated action will not take place.
For example, the CCR0 interrupt flag is set when the timer
counts up to the
value in CCR0 compare latch TBCL0. The counter must count from
TBCL0 –1 to TBCL0. If the TBCL0 value were simply written directly to the
timer with software, the interrupt flag would
not be set, even though the val-
ues in the timer and TBCL0 would be the same.
Topic Page
11.1 Introduction 11-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.2 Timer_B Operation 11-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.3 Timer Modes 11-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.4 Capture/Compare Blocks 11-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.5 The Output Unit 11-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.6 Timer_B Registers 11-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 11