Texas Instruments TMS320F20x/F24x DSP manual Subroutines Used By All Four Algorithms, SUTILS20.ASM

PRELIMINARY

Assembly Source for Algorithms

A.1.6 Subroutines Used By All Four Algorithms, SUTILS20.ASM

This assembly file includes two subroutines that change the flash module ac- cess mode and one subroutine that performs software delays. More details on the individual functions are given in the comments.

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**	Delay And Access Mode Subroutines			**
*				**
*	TMS320F2XX Flash Utilities.			**
*	Revision: 2.0, 9/10/97			**
*	Revision: 2.1, 1/31/98			**
*				**
*	Filename: sutils20.asm			**
*				**
*	Called by:	These utilities are used by CLEAR,ERASE,		**
*		PROGRAM algorithms written for F2xx		**
*		devices.		**
* Function:		DELAY	Delay loop specified by AR6.	**
*		REGS	Clears MODE bit of F_ACCESS0/1 to	**
*			access flash module control registers.	**

*ARRAY Sets MODE bit of F_ACCESS0/1 to access **

*the flash array.**

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	.include		ºsvar20.hº
	.def DELAY,REGS,ARRAY
	.sect	ºDLYº
*************************************
*Delays as follows:					*
*	LAR	AR6,#N	2	Cycles	*
*	CALL	DELAY	4	Cycles	*
*	RPT	#DLOOP	2*(N+1)	Cycles	*
*	NOP	DLOOP*(N+1)		Cycles	*
*	BANZ	DLY_LP	4*N+2	Cycles	*
*	RET		4	Cycles	*
*		±±±±±±±±±±±±±±±±±±±±±±±±			*
*	=	DLOOP(N+1)+6*N+14 Cycles			*
* Set N and DLOOP appropriately to					*
*	get desired delay.				*

**************************************
DELAY			;AR6 = OUTER LOOP COUNT
DLY_LP	RPT	#DLOOP	;APPROX 5US DELAY
	NOP
	BANZ	DLY_LP,*± ;LOOP UNTIL DONE
	RET		;RETURN TO CALLING SEQUENCE
	.page
**************************************************
* REGS		Clears MODE bit of F_ACCESS0/1 to		**

*access flash module control registers. **

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

.sect ºREGº

REGS

PRELIMINARY Assembly Source Listings and Program Examples A-25