Texas Instruments TMS320C2XX User Manual

Page 84

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Boot Loader

4-22

*
* Transfer code
*
LOOP

LACC

*+,8

; Load ACC with high byte of code shifted by 8 bits

SACL

HBYTE

; Store high byte

LACL

*+,AR0

; Load ACC with low byte of code

AND

#0FFH

; Mask off upper 24 bits

OR

HBYTE

; OR ACC with high byte to form 16-bit code word

SACL

CODEWORD

; Store code word

LACL

DEST

; Load destination address

TBLW

CODEWORD

; Transfer code to destination address

ADD

#1

; Add 1 to destination address

SACL

DEST

; Save new address

BANZ

LOOP,AR1

; Determine if end of code is reached

SPLK

#0,GREG

; Disable entire global memory

INTR

0

; Branch to reset vector and execute code.

.END

Note:

The INTR instruction in the boot loader program causes the processor to
push a return address onto the stack, but the device does not use a RET to
return to this address. Therefore, your program must execute a POP
instruction to get the address off the stack.

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