Texas Instruments TMS320F20x/F24x DSP manual Preliminary, Assembly Source for Algorithms, A-11

PRELIMINARY

Assembly Source for Algorithms

* The erase pulse duration is 7ms, and a maximum of		**
*	1000 pulses is applied to the array.	**
*		**

*The following resources are used for temporary storage: **

*	AR0	Used for comparisons	**
*	AR1	Used for erase pulse count	**
*	AR2	Used for main banz loop	**
*	AR6	Parameter passed to DELAY	**
*	BASE_0	Parameter passed to Set_mode	**
*	BASE_1	Used for flash address.	**
*	BASE_2	Used for flash data	**
*	BASE_3	Used for flash checksum	**
*	BASE_4	Used for segment size	**
*	BASE_5	Flash Erase command	**
*	BASE_6	Flash Erase+EXE command	**

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

	.include ºsvar20.hº ;defines variables for flash0
			;or for flash1 array
*
MAX_ER	.set	1000	;Allow only 1000 erase pulses.
VER1	.set	8	;VER1 command.
ER_CMND	.set	2	;ERASE COMMAND WORD
ER_EXE	.set	043h	;ERASE EXEBIN COMMAND WORD
INV_ER	.set	018h	;INVERSE ERASE COMMAND WORD
FL_WR	.set	6	;FLASH WRITE COMMAND WORD
FLWR_EX	.set	047h	;FLASH WRITE EXEBIN COMMAND WORD
STOP	.set	0	;RESET REGISTER COMMAND WORD
	.def	GERS
	.ref	PROTECT,SEG_ST,SEG_END
	.ref	DELAY,REGS,ARRAY
	.sect	ºfl_ersº

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

* GERS: This routine performs an erase to			*
* xorver1 level. The Seg to erase is defined by			*
* the vars SEG_ST and SEG_END. The following			*
* resources are used for temporary storage:			*
*	AR0	Used for comparisons	*
*	AR1	Used for erase pulse count	*
*	AR2	Used for main banz loop	*
*	BASE_0	Parameter passed to Set_mode	*
*	BASE_1	Used for flash address.	*
*	BASE_2	Used for flash data	*
*	BASE_3	Used for flash checksum	*
*	BASE_4	Used for segment size	*

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

GERS:

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

*	Code initialization section	*
* Initialize test loop counters:		*
*	AR1 is the number of ERASE pulses.	*

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

SETC	INTM	;Disable all	maskable ints.
SETC	SXM	;Enable sign	extension.

PRELIMINARY Assembly Source Listings and Program Examples A-11