PIC 16F690 contains a built-in serial communication unit. The program must read the receiver unit before it has received three characters. Pic16f690 Serial Communication C Code. The example showed how to use the external interrupt on the PIC16F690 to switch. PIC C source code pool. Pic16f690 Serial Communication C Code Operators In C. This is about the time it takes for the module to finish its communication with the operator.

PIC 16F877 series normally has five input/output ports. They are used for the input/output interfacing with other devices/circuits.

Most of these port pins are multiplexed for handling alternate function for peripheral features on the devices. All ports in a PIC chip are bi-directional. When the peripheral action is enabled in a pin, it may not be used as its general input/output functions. The PIC 16F877 chip basically has 5 input/output ports. The five input/output ports and its functions are given below. When enabling peripheral functions, more care should be taken in defining TRIS bits for each PORT C pin as compared to other. Some peripherals override the TRIS bit to make a pin an output, while other peripherals override the TRIS bit to make a pin an input.

Since the TRIS bit override is in effect while the peripheral is enabled, read-modify write instructions (BSF, BCF, and XORWF) with TRISC as the destination, should be avoided. The user should refer to the corresponding peripheral section for the correct TRIS bit settings. PORT E has only three pins (RE0/RD/AN5, RE1/WR/AN6 and RE2/CS/AN7) which are individually configurable as inputs or outputs. These pins controllable by using its corresponding data direction register “TRIS E”. These pins also have Schmitt Trigger input buffers. The PORT E pins become the I/O control inputs for the microprocessor PORT when bit PSPMODE is set.

In this mode, the user must make certain that the TRIS E bits are set and that the pins are configured as digital inputs. Also, ensure that ADCON1 is configured for digital I/O. In this mode, the input buffers are TTL.

Hello Mr Raj, Thank for your PIC post series, it is great your work for every beginner like me. I had followed stricky this your Uart guide, but unlucky. First times, when run hardware with USB-rs232 P9 convertor (without GND common to COM port of convertor)I can turn on/off LED (not receive any thing in ternminal), but after some my small change in code to send only one character or shorter string also on test board for better program over icsp which i did'nt recognized excactly which change is cause, i even now can not turn Led on/off also receive any thing. When i common ground PIC and COM convertor, i can receive sometimes some weird characters. I had came back to simulate in Proteus with virtual terminal and oscilloscope to measure on A and C channel for rx/tx and i could see pules in channels but also didnt received any character also turn on/off LED. My hardware board is supplied by 12v adapter over LM7805cv to 5v, pin 1 connected to pin 1 icsp with isolate circuit as PICkit2 datasheet. Could you guide me how to investigate those error, Thank You alot for your any commend and guide!

Thank for your soon reply, Mr Raj, (without GND common to COM port of convertor:That means when First time i tried in test board, i did'nt connect COM pin 5 to ground of test board but i could turn led on/off, but could not receive any thing on virtual terminal software. That is sames status for about 10 times.

But after some small change with code also hardware, or even recover back your original code, i even can not turn led on/off any more. When i connect COM pin 5 to ground of test board, sometimes i can see weird string in terminal (i understand that's for string in UART_init code), but still cannot turn led on/off. That means i can not transmit or receive any things. Stronghold torrent pirate bay sea. Sorry i stiil find how to post my picture or attach file in this reply which captures pulses in rx/tx channels on Proteus oscilloscope emulation evironment. Thank Raj, 1-I had never think to change MCU frequence, i thought frequence from crystal, after change mcu freq from 1 to 20 Mhz, i can see weird string as pic but still can not turn on/off LED 2- You mention to hex file that means MCU firmware, i click to MCU firmware and replace again your origin code and simulate again with same above state, have some warning as i casting example from UART_send_string('UART Module Initialized and active') to UART_send_string((char *)'UART Module Initialized and active'); to avoid warning but that 's for skip code warning only, simulation is same. Thank Mr Raj, Everything follow guide, but i'm still unlucky, i added max232 to simulation also to testboard and i had better result but still not complete it, not receive the exact expected result. I get ok result with other uart lesson (on test board, not well with simulation) which use C prinf function and BRGH = 0 also RCIE.