My project is simple at first look but i have some problems .
The idea is:

40 outputs with '0' at the beginning. Lets say one button 'Start'. When you push it the outputs starts to switch to '1' continuously. The delay between switching the outputs can be vary from 0.1 to 2.0 sec. Also the time that each one of the outputs is '1' have to be 1 sec.

I wrote a program for this with PIC16F874, but the outputs is not enough.Connecting two PIC16F874 via SPI was difficult for me. So i decide to use 5 shift registers with serial in/parallel out and register memory / 74594/595/596 etc. / . My problem is a subroutine that fill five registers in PIC16F874 lets say B1,B2,B3,B4,B5 which i will send to shift registers.

Sorry for my bad english, and if somebody can help me I will be very greatfull.