User manual

Timer_A Operation

12-12 Timer_A

Figure 12−11.Capture Cycle

Second

Capture

Taken

COV = 1

Capture

Taken

Capture

Taken

Read

Taken

Capture

Clear Bit COV

in Register TACCTLx

Idle

Capture

Capture Read and No Capture

Capture

Capture ReadCapture

Capture Initiated by Software

Captures can be initiated by software. The CMx bits can be set for capture on

both edges. Software then sets CCIS1 = 1 and toggles bit CCIS0 to switch the

capture signal between V

and GND, initiating a capture each time CCIS0

changes state:

MOV #CAP+SCS+CCIS1+CM_3,&TACCTLx ; Setup TACCTLx

XOR #CCIS0,&TACCTLx ; TACCTLx = TAR

Compare Mode

The compare mode is selected when CAP = 0. The compare mode is used to

generate PWM output signals or interrupts at specific time intervals. When

TAR counts to the value in a TACCRx:

- Interrupt flag CCIFG is set

- Internal signal EQUx = 1

- EQUx affects the output according to the output mode

- The input signal CCI is latched into SCCI