Embedded tools that
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CodeVisionAVR
Integrated Development Environment for the 8-bit Atmel AVR and XMEGA Microcontrollers
Libraries
Besides the standard C libraries, the CodeVisionAVR compiler features a rich set of libraries designed to fulfil all the needs of the embedded systems programmer.
The CodeVisionAVR libraries are not GPL-ed, therefore you are not obliged to publish the source code of your commercial application or pay us royalties for their commercial usage.
The CodeVisionAVR compiler features a set of libraries that support the following popular Real Time Clock (RTC) chips:
Philips PCF8563 (I2C/TWI interface)
Philips PCF8583 (I2C/TWI interface)
Maxim DS1302 (bit-banged serial interface)
Maxim DS1307  (I2C/TWI interface)
Maxim DS3231 (I2C/TWI interface)
The built-in CodeWizardAVR allows the user to easily configure the RTC libraries: