Mikroelektronika MikroE Development Kits MIKROE-87 Data Sheet

MikroElektronika

A real-time clock is used to keep the real time and date, generate interrupt and provide timer and alarm functions. Due to a battery cell, 

the operation of the real-time clock is enabled even when the microcontroller’s power supply goes off. The real-time clock is linked to 

a development system via a 2x5 female connector provided on the RTC board and a 2x5 male connector provided on the I/O port of 

the development system. The real-time clock communicates with the microcontroller using I

2

C serial communication. 

Figure 1: RTC board

Figure 2: RTC board’s bottom view

The function of pins provided on the PCF8583P circuit that is used for connection with the microcontroller:

INT 

- Open drain interrupt output

SCL 

- Serial clock line

SDA 

- Serial data line

The function of pins provided on the 2x5 female connector CN1:

P0  

- SCL pin for EasyAVR and BIGAVR development systems; 

P1 

- SDA pin for EasyAVR and BIGAVR development systems;

P2 

- SCL pin for BIGdsPIC, dsPICPRO, LV32MX and LV24-33 development systems; It is also used as an interrupt pin;

P3 

- SDA pin for BIGdsPIC, dsPICPRO, LV32MX and LV24-33 development systems and SCL pin for EasyPIC, BIGPIC,  

 

   LV18FJ and EasyLV18 development systems;

P4 

- SDA pin for EasyPIC, BIGPIC, LV18FJ and EasyLV18 development systems;

P5 

- Interrupt pin;

2x5 female connector enables the additional board 

to be connected to a development system

DIP switch SW1 is used to select a development 

system to connect the RTC board to

DIP switch SW1 is used to select a development system to connect the RTC additional board to. This switch also enables connection 

between the SDA, SCL and INT-RTC pins provided on the RTC board and a serial I

2

C module built into the microcontroller. Figure 3 

shows the pinout of the DIP switch SW1.