dsp281x_codestartbranch.asm

TMSC320F2812串口SCI通信,SCIA,SCIB,波特率设置

;//###########################################################################
;//
;// FILE:  DSP281x_CodeStartBranch.asm	
;//
;// TITLE: Branch for redirecting code execution after boot. 
;//
;//########################################################################### 	


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

WD_DISABLE	.set	1		;set to 1 to disable WD, else set to 0

    .ref _c_int00

***********************************************************************
* Function: codestart section
*
* Description: Branch to code starting point
***********************************************************************

    .sect "codestart"

code_start:
    .if WD_DISABLE == 1
        LB wd_disable       ;Branch to watchdog disable code
    .else
        LB _c_int00         ;Branch to start of boot.asm in RTS library
    .endif

;end codestart section


***********************************************************************
* Function: wd_disable
*
* Description: Disables the watchdog timer
***********************************************************************
    .if WD_DISABLE == 1

    .text
wd_disable:
    SETC OBJMODE        ;Set OBJMODE for 28x object code,after reset
                        ;AMODE=0,OBJMODE=0使CPU工作在27目标兼容模式
                        ;所以用指令SETC OBJMODE将ST1的位OBJMODE置1 
                         
    EALLOW              ;Enable EALLOW protected register access
    MOVZ DP, #7029h>>6  ;Set data page for WDCR register
    MOV @7029h, #0068h  ;Set WDDIS bit in WDCR to disable WD
    EDIS                ;Disable EALLOW protected register access
    LB _c_int00         ;Branch to start of boot.asm in RTS library

    .endif





	.end
	
; end of file CodeStartBranch.asm