The slave address byte contains the 7-bit DS1307 address, which is 1101000, followed by the direction bit (R/W), which for a write is 0. Asap rocky peso acapella songs. After receiving and decoding the slave address byte, the DS1307 outputs an acknowledge on SDA. After the DS1307 acknowledges the slave address + write bit, the master transmits a word address to the DS1307.
![Bascom Bascom](https://winneraspoy.weebly.com/uploads/1/2/4/2/124275813/498617948.jpg)
- The DS1307 in this example is connected directly to two of the I/O ports on a DS5000 microcontroller and the 2-wire handshaking is handled by low-level drivers, which are discussed in this application note. DS1307 Description The DS1307 Serial Real Time Clock is a low-power, full BCD clock/calendar plus 56 bytes of nonvolatile SRAM.
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- It seems to be determined automatically by the DS1307 based on the date set which makes sense I guess. Limchonghan said, November 14, 2012 @ 4:24 am correction for DS1307 on Arduino.cc Forum DS1307 RTC Tutorial at Ladyada DS1307 RTC at bildr Blog An I2C Bus Example Using the DS1307 Real-Time Clock DS1307 Ajit Nayak said.
An I2C Bus Example Using the DS1307 Real-Time Clock
A more complete description of I2C can be read here on Wikipedia, but I will give you the four sentence summary here. I2C is a serial data bus protocol that allows multiple devices to connect to each other with fairly slow data transfer rates. These slow data transfer rates are fast enough for many devices and allow the bus to be very simple to implement. The real beauty of this protocol is that you can control up to 112 devices with just two wires from a microcontroller. Many microcontrollers have a libraries to support I2C; on Arduino the official Wire library handles the details for you.
In this example I use an Arduino board as the bus master and have just one slave device on the I2C bus, a DS1307. You can read the DS1307 data sheet here. As I mentioned before Arduino has a library called Wire that handles all the details of the I2C protocol. Wire uses analog pin 4 for the Serial Data (SDA) connection and analog pin 5 for the Serial Clock (SCL) connection. The I2C protocol defines the bus as an open drain bus, which means you need to use pull-up resistors on each of the two bus wires. Here is the circuit of how I wired the DS1307 to Arduino using a I2C bus.
Here is the code I wrote. There are a lot of other places on the web that have code for using the DS1307, but I couldn’t find a simple and efficient one that just did what I needed. This code has two main functions for accessing the DS1307. One sets the time and date, and the other gets the time and date. The DS1307 returns it’s numbers coded in binary-coded decimal (BCD). This code also converts the numbers returned from the DS1307 out of BCD for you. If all you want to do is display the time BCD is probably better, but most of the time I won’t be just displaying the time. Instead I’ll be using it to decide when to run events and for this it’s better to work with normal numbers.
Ds1307 Bascom Programmable
UPDATE 5-20-2008
Updated the code to fix a few bugs Fabien pointed out. He also informed me of this: “Because you’re hooking up the clock to analog pins 4 & 5 on the Arduino and using the Wire lib, you don’t need to bother with pull-up resistors in your schematics. Turns out that the Arduino has built-in pull-up resistors for these pins. The Two Wire library enables the built-in pull-ups in the twi_init() function in twi.c (located here: arduino-0011hardwarelibrariesWireutility).” Steel panthers mbt for mac.
Updated the code to fix a few bugs Fabien pointed out. He also informed me of this: “Because you’re hooking up the clock to analog pins 4 & 5 on the Arduino and using the Wire lib, you don’t need to bother with pull-up resistors in your schematics. Turns out that the Arduino has built-in pull-up resistors for these pins. The Two Wire library enables the built-in pull-ups in the twi_init() function in twi.c (located here: arduino-0011hardwarelibrariesWireutility).” Steel panthers mbt for mac.
Ds1307 Bascom Programmer
Thanks Fabien!