The following line enables internal 8MHz and also the PLL which makes the microcontroller runs at 32MHz (8MHz x 4). Note that green, red and black tabs have the same controller ST7735R. If you have a TFT display with green or red tabs or a TFT with ST7735B controller read the driver topic above. My TFT display is ST7735R Black Tap (ST7735S) and for initializing this type of TFT display I used the following line: PIC12F1822 Has 1 SPI module, this module is used in this interfacing. PIC12F1822 and ST7735 SPI TFT Example CCS C code: In this project PIC12F1822 internal oscillator is used and MCLR pin function is disabled. PIC12F1822 and ST7735 SPI TFT Example Circuit: Put the downloaded C file in your project folder. Or you can just download it directly from the following link: ST7735 SPI TFT Display Driver for CCS PIC C compiler The following code snippet counts down from 99 to 0 on the displays of the UT-L 7-SEG R click.This post shows how to interface PIC12F1822 microcontroller with ST7735 SPI TFT display using CCS PIC C compiler.įor this interfacing we need a driver for the TFT display. Power Supply Voltage Selection 3V3/5V, down position 3V3, up position 5VĬode examples for UT-L 7-SEG R click, written for MikroElektronika hardware and compilers are available on Libstock. This table shows how the pinout on UT-L 7-SEG R click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). MAX6969 6-Port, 5.5V Constant-Current LED DriverĮxcellent character appearance, low power consumption Specificationsĭisplaying digits and letters on two 7 segment displays So, the IC allows you to connect multiple click boards™ - for applications that require more than two seven segment displays, such as digital clocks, temperature sensors, etc. Input data appears at the DOUT output 16 clock cycles later to allow cascading of multiple MAX6969s. The driver accepts data shifted into a 16-bit shift register using data input DIN and clock input CLK. The MAX6969 uses the industry-standard, shift-register-plus-latch-type serial interface. Since it is the PWM output pin on the mikroBUS™ by default, the LED segments light intensity could be controlled by software too. There is an additional OE (output enable) pin which is used to control the output driver state (enabled/disabled). It uses the common 4-wire serial bus for communication with MCU itself (LE, SCK, SDO, SDI on mikroBUS™ pin socket). The 7 segment displays are interfaced to the MCU over the MAX6969 16-port, constant-current LED driver IC. It communicates with the target microcontroller over SPI interface. The click is designed to run on either 3.3V or 5V power supply. UT-L 7-SEG R click carries two SMD ultra thin (3.1mm) LED 7-SEG displays and the MAX6969 constant-current LED driver from Analog Devices.
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