Texas Instruments TMS320F20x/F24x DSP manual Preliminary, Assembly Source for Algorithms, A-14

Assembly Source for Algorithms

PRELIMINARY

**

* The following resources are used for temporary storage: *

*	BASE_0	Flash STOP command, and FFFF for WDATA.	*
*	BASE_5	Flash erase command.	*
*	BASE_6	Flash erase + EXE command.	*

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

ERASE_A
* SET UP FLASH ERASE COMMANDS FOR PROTECT MASK.				**
LACL		PROTECT	;GET SEGMENT PROTECT MASK	**
OR		#ER_CMND	;OR IN ERASE COMMAND	**
SACL		BASE_5	;BASE_5 = ERASE COMMAND	**
OR		#ER_EXE	;OR IN EXEBIN COMMAND	**
SACL		BASE_6	;BASE_6 = ERASE EXE COMMAND	**
*				**
* MUST LOAD WDATA WITH FFFF.				**
SPLK		#0FFFFh,BASE_0 ;WDATA VALUE FOR ERASE		**
LACC		FL_ST	;ACC => FLASH	**
TBLW		BASE_0	;SET WDATA = FFFF	**
*				**
* THIS SECTION ACTIVATES THE WRITE COMMAND.				**
SPLK		#STOP,BASE_0	;Stop command.	**
CALL		SET_MODE	;Disable any flash cmds.	**
CALL	REGS		;ACCESS FLASH REGS	**
LACC		FL_ST	;ACC => FLASH	**
TBLW		BASE_5	;ACTIVATE ERASE	**
LAR		AR6,#D10	;SET DELAY	**
CALL	DELAY,*,AR6		;WAIT	**
*				**
* THIS SECTION ACTIVATES THE EXEBIN COMMAND.				**
TBLW		BASE_6	;START ERASURE	**
LAR		AR6,#D7K	;SET DELAY to 7 ms	**
CALL	DELAY,*,AR6		;WAIT	**
SPLK		#STOP,BASE_0	;STOP COMMAND	**
CALL		SET_MODE	;STOP ERASE	**
RET			;RETURN TO CALLING CODE	**

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

.end

A-14 PRELIMINARY