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Port B input - HCS08QB4

Question asked by David Richards on Aug 14, 2009
Latest reply on Aug 15, 2009 by bigmac

I am using an HCS08QB4. I have switch inputs on PTB0-3 and PTB5-7. PTB0-3 and PTB5 are working fine, but PTB6-7 are always reading 0. I have set PTBDD and PTBPE. The two non-working inputs are labelled PTB7/EXTAL and PTB6/XTAL. I am not using an external crystal, but how does the chip know this to use the port pins?




Added p/n to subject.

Message Edited by NLFSJ on 2009-08-18 10:03 AM