PIC as DTMF dialer

[OY2L]

If i need to use a 16F628 as a DTMF dialer may i use a crystal or is the internal oscillator stabil enough for it?

 

[Nigel Goodwin]

If i need to use a 16F628 as a DTMF dialer may i use a crystal or is the internal oscillator stabil enough for it?

The internal oscillator should be stable enough, DTMF doesn't require absolute accuracy.

 

[Gayan Soyza]

You could also use pulse dialing instead of tone dialing which were used in early years.

 

[OY2L]

Yes i know Gayan, i have a asm file with pulse dialing but i better like DTMF,