Texas Instruments TLV1562 - Manual (Page 95)

Software Overview
89 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP
ADC_mono_IRQ_Start:
ISTEP2: XF = 0 ; clear CSTART
ISTEP3: NOP
NOP
NOP ; wait for TW(CSTARTL)
ISTEP4: XF = 1 ; set CSTART
STEP5:
* wait until INT– goes low in polling the INT0 pin:
M1: TC = bit(*AR5,15–0) ; test, is the INT0 Bit in IFR=1?
if (NTC) goto M1 ; wait until INT– signal went high
IFR = #1 ; reset any old interrupt on pin INT0
* read sample
STEP2: XF = 0 ; clear CSTART
STEP10: @ADSAMPLE = port(ADC) ; read the new sample into the DSP
STEP4: XF = 1 ; wait for TW(CSTARTL) and set CSTART
**********************************
* STORE:
* saving the samples into memory
**********************************
STORE:
* store new sample into DSP data memory
*AR7+ = data(@ADSAMPLE) ; write last sample into memory table
* test for table end, set pointer back if true
TC = (AR0 ==AR7) ; is AR0 = AR7? (table end reached?)
if (NTC) goto STORE_END ;
* finish conversion
CPL = #1 ; do stack pointer addressing
AR7 = pop() ; restore AR7
AR6 = pop() ; restore AR6
A = #0 ; clear ACCU
RETURN ; jump back to C–layer
STORE_END:
goto STEP5 ; go back to receive next sample
**************************************************************
* IRQ_INT0:
* Interrupt routine of the external interrupt input pin INT0
**************************************************************
IRQ_INT0:
return_enable ; return from IRQ (wake up from the IDLE mode)
**************************************************************************
* BXINT0:
* Interrupt routine of the serial transmit interrupt of the buffered SPI
**************************************************************************