RS232 with 16F628 problem

[mister_e]

i don't have any of those 4.XXX crystal here and that cause you timing problem... for sure since PBP don't know that specific speed. Easy way to solve the problem, use the internal 4mhz one wich you can select at the programing time or by setting the configuration fuse into your program.
set configuration fuse into your program

another way, let's calculate the right SPBRG value for your crystal. By using the formula in the datasheet use SPBRG=114 or 115 try both.

[SuB-ZeRo]

SPBRG=114 is the correct number.How can u calculate the number 114?Can u teach me?Or is there any simple program that calculates that value?It really works good u help me soo much i really don't know how to thank u.

[mister_e]

Great!

The way to calculate the SPBRG is in the datasheet. section 12.1 table 12-1

I set BRGH=1 in the TXSTA value so you use

BaudRate=Fosc/(16(x+1))

few math mods later you get
X=(Fosc/(BaudRate*16))-1

now you can easily do you own VB calculator for that