Texas Instruments TLV1562 - Manual (Page 89)

Software Overview
83 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP
@CR1_SEND ^= #RES_10_BIT ; clear bit for 10–Bit Resolution
@CR1_SEND |= #RES_4_BIT ; set 8–Bit conversion mode
.endif
.if (EXTERNAL_CLOCK)
@CR0_SEND ^= #CLK_INTERNAL ; clear CLK_INTERNAL bit if one
@CR0_SEND |= #CLK_EXTERNAL ; set CLK_EXTERNAL mode
.endif
.if (DIFF_INPUT_MODE)
@CR0_SEND ^= #SINGLE_END ; clear single ended input bit if one
@CR0_SEND |= #DIFFERENTIAL ; set differential input mode
.endif
****************************************************************************
* Calibration:
* do a calibration of the input if chosen (the location of this instruction
* is only for an EVM test, in practice, the calibration procedure should
* be executed when the inputs are shorted to the correct voltage and after
* calibration, the analog signal is to apply before doing any further signal
* conversion)
* the calibration implementation is more or less inserted as an example
****************************************************************************
.if (IME_CALIBRATION)
call CALIBRAT_INTERNAL_MID_SCALE
.endif
.if (SME_CALIBRATION)
call CALIBRAT_SYSTEM_MID_SCALE
.endif
****************************
* ADC_INI:
* set ADC register CR0/CR1
****************************
ADC_INI:
* write CR1:
port(ADC) = @CR1_SEND ; Address decoder sets CS low,
; WR low and send CR1 value to the ADC
NOP ; wait for tW(CSH)=50ns
* write CR0
port(ADC) = @CR0_SEND ; send CR0 value to the ADC
STEP1: port(DEACTIVE) = @ZERO ; deselect ADC (CS high)
STEP2: NOP ;
NOP ;
NOP ; wait for t(SAMPLE1)=100ns
* initialize longer waitstates:
DP = #00000h ; point to page zero