Texas Instruments TLV1562 - Manual (Page 55)

Software Overview
49 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP
* reset pending IRQs
IFR = #1 ; reset any old interrupt on pin INT0
.endif
.if INT0_DRIVEN
* enable Interrupt INT0
@IMR |= #01 ; allow INT0
.endif
* enable global interrupt (this is required even if no IRQ routine is used
* by this program because the GoDSP debugger needs to do its backgroud interrupts)
INTM = 0 ; enable global IRQ
* initialize storage table for the ADC samples
AR7 = #(data_loc_A) ; point to first date location of the storage table
AR0 = #(num_data_A+data_loc_A ); AR0 points to table end
DP = #AD_DP ;
@ADCOUNT= #(num_data_A) ; initialize ADCOUNT with the number of
required samples
.if POLLING_DRV
AR5 = #(IFR) ; AR5 points to the IFR register (only for
polling mode)
.endif
DP = #AD_DP
@ZERO = #00000 ; set the dummy send value
* initialize the send values to set–up the two programmable register of the ADC
@CR0_SEND = #(CH1|MONO_INT|SINGLE_END|CLK_INTERNAL|NO_CALIB_OP);
@CR1_SEND = #(NO_SW_PWDN|NO_AUTO_PWDN|NO_2COMPLEMENT|NO_DEBUG|RES_10_BIT|RD_CONV_START);
* change some of the possible modes by variation of the bit setting in the file header
* this next steps can be erased, if the user is running in only one special configuration
.if (R8BIT_RESOLUT)
@CR1_SEND ^= #RES_10_BIT ; clear bit for 10–Bit Resolution
@CR1_SEND |= #RES_8_BIT ; set 8–Bit conversion mode
.elseif (R4BIT_RESOLUT)
@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