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STM32F1与STM32CubeIDE编程实例-74HC595驱动4位7段数码管
2022-07-04 03:55:00 【视觉智能】
74HC595驱动4位7段数码管
1、74HC595介绍
74HCT595 是一个 8 位串行输入/串行或并行输出移位寄存器,带有一个存储寄存器和三态输出。移位寄存器和存储寄存器都有独立的时钟。该器件具有串行输入 (DS) 和串行输出 (Q7S) 以启用级联和异步复位 MR 输入。 MR 上的低电平将复位移位寄存器。数据在 SHCP 输入的低电平到高电平转换时移位。移位寄存器中的数据在 STCP 输入从低电平到高电平转换时传输到存储寄存器。如果两个时钟连接在一起,移位寄存器将始终比存储寄存器早一个时钟脉冲。只要输出使能输入 (OE) 为低电平,存储寄存器中的数据就会出现在输出端。 OE 上的高电平会导致输出呈现高阻抗关断状态。 OE 输入的操作不会影响寄存器的状态。输入包括钳位二极管。这使得可以使用限流电阻将输入接口连接到超过 VCC 的电压。
在前面的文章中,对74HC595及其使用做了详细的介绍,请参考:
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