Tutorial Microcontroller MCS-51 ATMEL ISP

Microcontroller Kits
Programmer and Target 89s51

Simple Mikrokontroller 89s51 Trainer

Mikrokontroller 89s51 Trainer

Super Mikrokontroller Trainer 89s51


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Interfacing the DS1307/1308 ( RTC )
with 8051 Microcontroller and over
PC Serial Port


The DS1307 Serial Real Time Clock, which incorporates a 2–wire serial interface, can be controlled using an 8051–compatible. The DS1307 is connected directly to two of the I/O ports on a microcontroller and the 2–wire handshaking is handled by low–level drivers, which are discussed in this final projects.

The DS1307 Serial Real Time Clock is a low–power, full BCD clock/calendar plus 56 bytes of nonvolatile SRAM. Address and data are transferred serially via the 2–wire bi–directional bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with less than 31 days, including corrections for leap year. The clock operates in either the 24–hour or 12–hour format with AM/PM indicator. The DS1307 has a built–in power sense circuit which detects power failures and automatically switches to the battery supply.

The system is configured as shown in Figure 1. The DS1307 has the 2–wire bus connected to two I/O port pins of the microcontroller: SCL – P1.0, SDA – P1.1. The VDD voltage is 5V, RP = 5KW and the 8051 is using a 12 MHz crystal.

rtc application serial communication microcontroller PC

Download File : rtc.asm

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