initial.asm

来自「TI公司生产的C54系列DSP中断实验程序」· 汇编 代码 · 共 25 行

	.mmregs
	.global _initial
    .text    
_initial:
	NOP
	LD #0, DP  		     ; reset data pointer
	STM #0, CLKMD        ; software setting of DSP clock
	STM #0, CLKMD        ; (to divider mode before setting)
TstStatu1:
    LDM CLKMD, A
    AND #01b, A          ;poll STATUS bit
    BC TstStatu1, ANEQ	
	STM #0xF7FF, CLKMD  ; set C5402 DSP clock to 10MHz
	STM  0x3FA0, PMST   ; vectors at 3F80h

	ssbx 1,11        ; set st1.intm=1 stop all interrupt
	stm  #00h,imr	;stop all interrupt
	stm  #0ffffh,ifr	;clear all interrupt sign
	
	stm  #04h,imr	;allow int2 interrupt
	rsbx  1,11 		;allow all interrupt
	ret 	
.end