Texas Instruments TLV1562 - Manual (Page 78)

Software Overview
72 SLAA040
* read sample
STEP2: XF = 0 ; clear CSTART
STEP10: @CH1_ADSAMPLE = port(ADC) ; read the new sample into the DSP
STEP14: @CH2_ADSAMPLE = port(ADC) ; read the new sample into the DSP
STEP3: ; wait for TW(CSTARTL)
.if (AUTO_PWDN_ENABLE)
* wait 800ns before finishing the sampling (requirment in Auto power down mode)
repeat(#38)
nop ; wait for 40 clock cycles [t(APDR)=1000ns]
.endif
STEP4: XF = 1 ; wait for TW(CSTARTL) and set CSTART
call STORE ; store the last sample into the table
.if INT0_DRIVEN
return ; return from routine back to IRQ_INT0
.else
goto STEP5 ; go back to receive next sample
.endif
**********************************
* STORE:
* saving the samples into memory
**********************************
STORE:
.if (SEND_OUT_PARALLEL)
* store sample into the parallel buffer location if chosen
port(DAC1) = @CH1_ADSAMPLE ; update DAC output with sample one
.endif
.if SAVE_INTO_MEMORY
* store new sample into DSP data memory
*AR7+ = data(@CH1_ADSAMPLE) ; write last sample of channel 1 into memory table
*AR6+ = data(@CH2_ADSAMPLE) ; write last sample of channel 2 into memory table
.endif
.if SEND_OUT_SERIAL
* store sample into the serial buffer location
DP = #00000h ; point to page zero
TC = bitf(@SPC,#01000h); test, is the XRDY Bit in SPC=1?
if (TC) goto SEND_SERIAL_END ; don’t send something until XDR is empty
; this has been included because the serial DAC TLC5618A isn’t able to understand
; endless data–stream (the CS should not become high before end of sending
; the 16th bit)
DP = #AD_DP ; reset Data page pointer to variables
A = @ADSAMPLE<<2 ; leftshift of the sample for a 12 bit format
@ADSAMPLE = A ;