ex4_4.asm

用C语言编写的DSP程序

		.mmregs
		.global _c_int00
		
STACK	.usect	"STACK", 10H
		.bss	a, 4
		.bss	x, 4
		.bss	y, 1
		.def	start
		.data
table:	.word	1*32768/10		;注意小数的表示方法
		.word	2*32768/10
		.word	-3*32768/10
		.word	4*32768/10
		.word	8*32768/10
		.word	6*32768/10
		.word	-4*32768/10
		.word	-2*32768/10
		
		.text
_c_int00:
		STM     #STACK+10,	SP
		B 		start
				
start:	SSBX	FRCT		;设置状态寄存器的小数方式位
		STM		#a, AR1
		RPT		#7
		MVPD	table, *AR1+  ;装入数据
		STM		#x, AR2
		STM		#a, AR3
		RPTZ	A, #3
		MAC		*AR2+, *AR3+, A	;双操作数指令
		STH		A, *(y)
end:	B		end
		.end