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Timer_B Operation

Example 13-1. Recommended Use of TBIV

; Interrupt handler for TBCCR0 CCIFG. Cycles

CCIFG_0_HND

... ; Start of handler Interrupt latency 6

RETI 5

; Interrupt handler for TBIFG, TBCCR1 and TBCCR2 CCIFG.

TB_HND ... ; Interrupt latency 6

ADD &TBIV,PC ; Add offset to Jump table 3

RETI ; Vector 0: No interrupt 5

JMP CCIFG_1_HND ; Vector 2: Module 1 2

JMP CCIFG_2_HND ; Vector 4: Module 2 2

RETI ; Vector 6

RETI ; Vector 8

RETI ; Vector 10

RETI ; Vector 12

TBIFG_HND ; Vector 14: TIMOV Flag

... ; Task starts here

RETI 5

CCIFG_2_HND ; Vector 4: Module 2

... ; Task starts here

RETI ; Back to main program 5

; The Module 1 handler shows a way to look if any other

; interrupt is pending: 5 cycles have to be spent, but

; 9 cycles may be saved if another interrupt is pending

CCIFG_1_HND ; Vector 6: Module 3

... ; Task starts here

JMP TB_HND ; Look for pending ints 2

389

SLAU144J–December 2004–Revised July 2013 Timer_B

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