Texas Instruments TLV1562 manual Flow Charts and Comments for All Software Modes, Task

Software Overview

Task 1.2:

Use channel B in differential input mode and an external clock source. Following changes have to be done with the set-up of Task 1.1:

Table 14. Instruction in the Program Header (Step 1)

R10BIT_RESOLUT	.set 00001h ; enable 10-bit resolution
R8BIT_RESOLUT	.set 00000h
R4BIT_RESOLUT	.set 00000h
INTERNAL_CLOCK	.set 00000h
EXTERNAL_CLOCK	.set 00001h ; use external clock
AUTO_PWDN_ENABLE	.set 00000h ; disable auto power down
DIFF_INPUT_MODE	.set 00001h ; differential input mode
IME_CALIBRATION	.set 00000h ; no internal calibration
SME_CALIBRATION	.set 00000h ; no system calibration

Additional correction in the middle of the main program files (step 2):

@CR0_SEND = #(PAIR_BMONO_INTSINGLE_ENDCLK_INTERNALNO_CALIB_OP);

@CR1_SEND = #(NO_SW_PWDNNO_AUTO_PWDNNO_2COMPLEMENTNO_DEBUGRES_10_BITRD_CONV_START);

CAUTION:

Changing statements in step 2 is not required, if they are already defined in the header. For example, the statement CLK_INTERNAL does not change to CLK_EXTERNAL in step 2 because the clock source is defined in the program header and therefore will be justified behind the step 2 instructions later in the program. That is why in step 2 only the CH1-value is replaced with PAIR_B, but nothing else has been specified.

8.4.1.6Common Software for all Modes

The files CONSTANT.ASM and VECTORS.ASM include constant definitions and the interrupt vector table. Those parameters are identical for all ADC modes. Therefore, the two files will be used for each mode and are described next:

CONSTANT.ASM	Definition of constant values as it is the bit code for different
	ADC modes (CR0/1), the serial DAC send words and the
	DSP memory saving locations
VECTORS.ASM	Interrupt vector table of the TMS320C542
CALIBRAT.ASM	ADC calibration procedure (except for mono interrupt driven
	mode using	RD,	this mode has not implemented any
	calibration so far)

8.5Flow Charts and Comments for All Software Modes

The following paragraphs show the flow charts and include comments for all software modes.

8.5.1The Mono Interrupt Driven Mode Using RD to Start Conversion

The following descriptions explain the software for the data acquisition in monomode. The required interface connections are shown in Figure 1.

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 27