DTMF Holtek 9200A

[husslemk4]

I tried using a phillips DTMF chip to create my DTMF tones but as it was a surface mount chip i had difficulty connecting it without burning the chip. So i have turned to another method, of using the Holtek HT9200A it is the serial version of the chip and is a DIP so should be easier to connect. The only problem is, iam not sure how to programm it (with the picaxe) as its a version of the serial connection iam not used to, the data sheet is http://www.rapidonline.com/netalogue/specs/82-4082e.pdf does anyone have an ideas how to use it? Many thanx
Hussy

 

[SD2100]

Your going to have do something similar to the following

This is for one digit only

high ce
high clock
low ce
put LSB data bit on data pin
low clock
high clock
put next data bit on data pin
low clock
high clock
put next data bit on data pin
low clock
high clock
put next data bit on data pin
low clock
high clock
put MSB data bit on data pin
low clock
high clock