AN413 datasheet(30/45 Pages) STMICROELECTRONICS

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Examples of timer 0 configurations

AN413

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Doc ID 1875 Rev 2

Appendix C

Examples of timer 0 configurations

;***********************

;*DEFINE TIMER 0 MACROS*

;***********************

.macroT0_START_IT

; start timer 0, enable interrupts

spp #T0D_PG

; select Timer 0 data register page

and T_TCR,#ccl

; counter clear bit

or T_TCR,#cen

; counter enable bit

or T_IDMR,#gtien

; global interrupt mask

.endm

.macroT0_START_DMA_CAP

; start timer 0, enable interrupts

; and DMA

spp #T0D_PG

; select Timer 0 data register page

or T_IDMR,#( gtien | cp0d ); global interrupt mask

or T_TCR,#cen

; counter enable bit

.endm

.macroSTOP_T0

; stop Timer 0

spp #T0D_PG

; select Timer 0 data register page

and T_IDMR,#gtien ; global interrupt mask

and T_TCR,#cen

; counter enable bit

.endm

;************************************************************

proc GEST_T0_ITCAPT{

;Configuration of Timer 0 for IT CAPTURE

;TCR:

- stop count

;

- clear on capture

;

- up count

;TMR:

- disable output

;

- internal clock

;

- disable bivalue mode

;

- disable retrigger mode

;

- disable REG1 mode

;

- continuous mode

;

- enable REG0 mode

;ICR:

- EXTA Trigger

;

- falling edge on EXTA

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