Texas Instruments TLV1562 manual Software Overview, SLAA040

Software Overview

* clear mode related bits in CR0 and set MONO_INT:

@CR0_SEND &= #(MONO_INT^0FFFFh)	; clear bit for no calibration use
@CR0_SEND &= #(DUAL_INT^0FFFFh)	; clear bit for no calibration use
@CR0_SEND &= #(MONO_CONTINUOUS^0FFFFh); clear bit for no calibration use
@CR0_SEND &= #(DUAL_CONTINUOUS^0FFFFh); clear bit for no calibration use

@CR0_SEND	= #MONO_INT	; set calibration for further use
* clear clock	related bits in CR0 and set internal clock mode:
@CR0_SEND &= #(CLK_INTERNAL^0FFFFh)		; clear bit for no calibration use
@CR0_SEND &= #(CLK_EXTERNAL^0FFFFh)		; clear bit for no calibration use
@CR0_SEND = #CLK_INTERNAL		; set calibration for further use
* set mode for intermal offset calibration:
@CR_CALIBRA = #INT_OFF_CALIB		; set internal calibration mode

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*verify ADC register CR0/CR1

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*write CR1 (to reset old CSTART mode initialization, because otherwise, the ADC never sets

*back its INT– pin to show a sample is available:

@CR_PROBLEM = #(SW_PWDNNO_AUTO_PWDNNO_2COMPLEMENTNO_DEBUGRES_10_BITRD_CONV_START);

port(ADC) = @CR_PROBLEM	; Address decoder sets CS low,
	; WR– low and send CR_PROBLEM value to the ADC
NOP	; wait for tW(CSH)=50ns

*write CR1

*initialize the send values to setup the two programmable registers of the ADC

@CR_PROBLEM = #(NO_SW_PWDNNO_AUTO_PWDNNO_2COMPLEMENTNO_DEBUGRES_10_BITCST_CONV_START);

port(ADC) = @CR_PROBLEM	; send CR0 value to the ADC
port(DEACTIVE) = @ZERO	; deselect ADC (CS high)
NOP	; wait for tW(CSH)=50ns
* write CR0
port(ADC) = @CR_CALIBRA	; send CR0 value to the ADC
port(DEACTIVE) = @ZERO	; deselect ADC (CS high)
NOP	; wait for tW(CSH)=50ns

********************************************

*do one sample to perform the calibration

********************************************

XF	=	0	; clear CSTART
repeat(#10)
nop			; wait for some sampling time
XF	=	1	; reset CSTART

repeat(#34)

54SLAA040