@Roberto,
I checked now the datasheet of Motorola 145026. I can tell you the idea is absolutely same. There are some differences like followings;
- the pilot period is 18 clocks in motorola, (36 clocks in Holtek)
- the type of the HIGH - LOW and Z bits are different but idea is same
HIGH= in holtek it is 2 low-one high-2 low -one high
in motorola 1 low -7 High - 1 low - 7 High
I do not give here the other bits I hope you understand the differences.

If you work already with motorola I am sure you can help me. I wait your kind reply.
ero