Abstract: This application note explains how the DS1302 RTC connects to an 8051 microcontroller via a 3-wire interface. Design examples include circuit schematics and C language interface programs.
DS1302 pin configuration
Overview This application note describes the interface between the DS1302 serial real-time clock and the 8051 microcontroller. The provided program code can implement basic interface functions. The microcontroller used in this article is DS2250, and the program is written in C language. Working principle The interface program uses the three general-purpose ports of the microcontroller to control the 3-wire synchronous bus. The microcontroller initiates data transmission by sending a command byte to the DS1302. Subsequently, the microcontroller sends other data and / or SCLK to the DS1302, and the data is sent or received according to the command byte.
The program list is shown in Figure 1, and the circuit schematic is shown in Figure 2.
Figure 1. Program list (download ZIP file)
View larger image Figure 2. DS1302 RTC schematic
DS1302 pin configuration
Overview This application note describes the interface between the DS1302 serial real-time clock and the 8051 microcontroller. The provided program code can implement basic interface functions. The microcontroller used in this article is DS2250, and the program is written in C language. Working principle The interface program uses the three general-purpose ports of the microcontroller to control the 3-wire synchronous bus. The microcontroller initiates data transmission by sending a command byte to the DS1302. Subsequently, the microcontroller sends other data and / or SCLK to the DS1302, and the data is sent or received according to the command byte. The program list is shown in Figure 1, and the circuit schematic is shown in Figure 2.
Figure 1. Program list (download ZIP file)
View larger image Figure 2. DS1302 RTC schematic
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