18F67K40 PIN_B0 input problem

[developer]

hi,
I designed circuit and i use pin_b0 pin input, but it it not working.

Circuit: Input terminal is 24V, voltage divider(22k - 4k7), 5v1 zener => pin_b0 input. I measure input terminal is 24V but pin_b0 voltage is 0.7V and it does not change. I use set_tris_b(0xFF); and test code

[Ttelmah]

If you can, you need to rule out your hardware. If the chip is socketted, remove it, and see if the pin goes high when the PIC is not there.
Something silly, like the zener connected backwards would give that behaviour.
In software, if your test is genuinely simple, and just has the chip waking, sets the TRIS, and tests the bit, then there is no reason for the PIC to hold this low.
Obviously if you have more complex code, the possibility does exist that something in the code is setting the pin as an output and pulling it low. This comes down to investigating every instruction that talks to PortB.
There is no peripheral on PortB, other than simple I/O, that can pull the pin low.