Texas Instruments TLV1562 - Manual (Page 69)

Software Overview
63 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP
* write CR0
port(ADC) = @CR0_SEND ; send CR0 value to the ADC
port(DEACTIVE) = @ZERO ; deselect ADC (CS high)
NOP ; wait for tW(CSH)=50ns
*******************************************
* ADC_mono_IRQ_Start:
* read samples and store them into memory
*******************************************
ADC_mono_IRQ_Start:
ISTEP2: XF = 0 ; clear CSTART
ISTEP3: NOP
NOP
NOP ; wait for TW(CSTARTL)
ISTEP4: XF = 1 ; set CSTART
STEP5:
.if POLLING_DRV
* 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 goes high
IFR = #1 ; reset any old interrupt on pin INT0
.elseif INT0_DRIVEN
* user main program area (this could execute additional code)
* go into idle state until the INT0 wakes the processor up
USER_MAIN: IDLE(2) ; the user software could do something else here
goto USER_MAIN ;
.elseif NO_INT0_SIG
* instead of using the INT signal, the processor waits
* for 6ADCSYSCLK+49ns and reads then the sample
repeat(#32)
nop ; wait for 34 processor cycles
.endif
* read sample
STEP2: XF = 0 ; clear CSTART
STEP10: @ADSAMPLE = port(ADC) ; read the new sample into the DSP
.if (AUTO_PWDN)
* wait 800ns before finishing the sampling (requirment in Auto power down mode)
repeat(#24)
nop ; wait for 20 clock cycles [t(APDR)=500ns]
.endif