Texas Instruments TLV1562 manual Software Overview, Initialize SPI, Save, Pull Down CSTART

Software Overview

1

Start

No

Initialize DSP

Wait States, AR Pointer, IRQ Table, Data Memory, Serial Port

H/L Transition on INTO ?

Initialize SPI

Yes

Active Transmitter, Use Frame Sync,

Generate External Clock

SAVE_

INTO

_MEMORY = 1

INTO (External Interrupt)

Save Modified Register of

SAVE_INTO_MEMORY = 0

Initialize DSP Memory For Sample Store

AR7 Points to The First Store Location

The IRQ Routine, if Not

AR0 Points to The Table End

Automatically Saved by The

ADCOUNT = Table Size (Number of Samples)

DSP

(Not Required)

IME CALABRATION = 1

1

IME CALABRATION = 0

Calibrate Internal Midscale Error

SME CALABRATION = 1

Calibrate System Midscale Error

IME CALABRATION = 0

Initialize (Id) The Two ADC Registers

CR0 = CR0_SEND

CR1 = CR1_SEND

Start Sampling

Pull Down CSTART

Wait 100 ns

Stop Sampling and Start Conversion

Reset CSTART (Set Back High)

INTO_DRINEN = 1	POLLING_DRIVEN =	NO_INTO_SIGNAL =
	1	1
Main Program	Wait Until End of Conversion	Wait Until End of Conversion
Stay in Idle Mode	Poll INTO Pin Until h/0 Transition Occurs	Wait For a Certain Time
1
INTO
	2
	Start New Sampling
	Pull Down CSTART
	Read Sample
	Stop Sampling and Start Conversion
	Reset CSTART (Set Back High)	SAVE_INTO_MEMORY = 0
SEND_OUT_PARALLEL = 1		Store Sample Into Memory
Copy Last Sample to Parallel DAC	SEND_OUT_PARALLEL = 1	Save Sample to AR7 – Pointed Location
	Start New Conversion	Table End Reached?	No
		(AR7 = AR0 ?)
SEND_OUT_SERIAL = 1
Copy Last Sample to Serial DAC		Yes
	SEND_OUT_SERIAL = 0	Reset Actual Memory Pointer
if Send Register is Empty
		AR& = First Memory Store Location
	SAVE_INTO_MEMORY = 0

Figure 7. Flow Chart Mono Interrupt Driven Mode Using CSTART to Start Conversion

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 31