14400 Baud 8N1

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e.chain

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Looking for some source code to send and receive hex files through RS232, with this settings 14400 Baud Rate, 8 Data, Parity none, 1 Stop bit, Thanks.
 
hi,
This should help with the baud rate calculations.

Which type of MCU and programming language ?
 
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Thanks for your quick reply, assembler is what I understand better. It could be 16F628A or 12F series.
 
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Check my tutorials, they give assembler for both software and hardware UART's, actually at 9600 baud, but it's trivial to chnage to 14400 baud.
 
Hi Nigel, I am working on your 7.1 Tutorial, do you think this will be accurate for 14400 Baud Rate. Sorry I am a beginner.

Code: 
Start_Delay MOVLW   0x06
            MOVWF   Delay_Count
Start_Wait  NOP
            DECFSZ  Delay_Count , f
            GOTO    Start_Wait
            RETURN

Bit_Delay   MOVLW   0x0C
            MOVWF   Delay_Count
Bit_Wait    NOP
            DECFSZ  Delay_Count , f
            GOTO    Bit_Wait
            RETURN
 
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If you use a 16F628A there is a hardware USART that does most of the work for you. Just set it and go. Another member here MikeK8LH wrote a baud rate calculator.
**broken link removed**
 
blueroomelectronics said:
If you use a 16F628A there is a hardware USART that does most of the work for you. Just set it and go. Another member here MikeK8LH wrote a baud rate calculator.
**broken link removed**
Click to expand...
Thanks, but I will have to try with the original formula that is located in the Microchip Document because this program doesn't calculate 14400 Baud Rate.
 
e.chain said:
I think the correct calculation for the SPRBG is 16.36 using BRGH=1.
Click to expand...

Another way to give an approximation would be to look at the Baud table on the datasheet [brgh=1]
for the 7.16MHz xtal, 57600 baud is 4 times 14400 and it specifies a figure of 7.

So for 14400 it would be 28.

So 4MHZ/7.16MHz * 25 = 15.6 , nearest integer value is 16.
I didnt calculate the error.

Ideally you want a 7.16MHz xtal

Does this help?
 
Yes, Thank you.
 
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