Texas Instruments TMS320F20x/F24x DSP manual Preliminary, A-42

Sample Assembly Code to Erase and Reprogram the TMS320F240

PRELIMINARY

F240INIT: ;Set Data Page pointer to page 1 of the ;peripheral frame

LDP #DP_PF1		;Page DP_PF1 includes WET through *
		;EINT frames
;initialize WDT registers
SPLK	#06Fh, WDCR	;clear WDFLAG, Disable WDT
		;(if Vpp=5V), set WDT
		;for 1 second overflow (max)
SPLK	#07h, RTICR	;clear RTI Flag,
		;set RTI for 1 second overflow
		;(max)

;EVM 10±MHz oscillator settings. ;(XTAL2 open, OSCBYP_=GND)

SPLK #00B1h,CKCR1 ;CLKIN(OSC)=10MHz, ;Mult by 2, Div by 1.

SPLK #00C3h,CKCR0 ;CLKMD=PLL Enable,SYSCLK=CPUCLK/2

;Clear reset flag bits in			SYSSR
;(PORRST, PLLRST, ILLRST,			SWRST, WDRST)
LACL	SYSSR	;ACCL	<= SYSSR
AND #00FFh		;Clear upper 8 bits of SYSSR
SACL	SYSSR	;Load new value into SYSSR

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

**	First, erase flash1 by invoking the clear and erase	**
**	algorithms.	**
**	Note: Three parameters must be initialized before	**
**	calling the algorithms.	**

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

LDP	#PARMS
SPLK	#0,ERS_COUNT ;Set erase fail count to 0.

**********Put parameters where they belong.**********

SPLK #0ff00h,PROTECT SPLK #00000h,SEG_ST SPLK #03FFFh,SEG_END

***********First, clear flash ************

ers_loop:
CALL	GCLR	;Clear flash.
LACL	ERROR	;Check for CLEAR/ERASE error
clrerr: BCND	ers_error,neq	;If error, then hard fail.

***********Next erase flash ************

CALL	GERS	;Erase flash.
LACL	ERROR	;Check for CLEAR/ERASE error
BCND	depletion,neq	;If error, then try Flash±write.
B	ers_done	;Else, no errors erasing.

A-42 PRELIMINARY