单极性模拟电压输出DAC0832与STC89C52接口电路输出三角波，用汇编程序

以下是将DAC0832与STC89C52微控制器连接的接口电路：

            +5V
             |
             |
             |
             |
   +--------|Vref
   |         |
   |         |
   |         |
  CS        CLK
   |         |
  DATA      DIN
   |         |
   +---------|

以下是使用汇编程序输出三角波的示例代码：

; 定义端口名称和控制信号
DAC_CS equ P2.0 ;DAC CS
DAC_CLK equ P2.1 ;DAC CLK
DAC_DATA equ P2.2 ;DAC DATA

; 定义计数器和DAC输出值
ORG 0000H
MOV DPTR, #Table ;设置指针指向三角波表
MOV R0, #0 ;计数器清零
AGAIN:
MOV A, R0 ;读取计数器值
MOVX @DPTR, A ;将计数器值作为DAC输出
INC DPTR ;指针加1
INC R0 ;计数器加1
CJNE R0, #255, AGAIN ;如果计数器不等于255，继续循环
Table:
DB 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255

该程序将三角波表中的值发送到DAC0832，并将其转换为模拟电压输出。注意，该程序中使用的三角波表是从0到255的数字序列。如果需要输出不同的波形，需要修改波形表中的数据。