Stability issues with ADC?

[PCM programmer]

His A/D is not configured for 10-bit mode. The compiler defaults to
8-bit mode.

Here's the code from the .LST file for the posted program
The A/D is configured for left-justified output. Then, only
the MSB of the result is read, from the ADRESH register.
This discards the lower two bits. The posted program
puts this 8-bit result into the LSB of a 16-bit variable.
The code below clears the MSB of the variable.

[sonicfire]

I now understand why the PWM only accepts values from 0 to 19, but I'm not sure why the A/D converter returns a number 0 to 1023. I tried implementing the change with no success. The scope output is unintelligible. I can manually set the A/D value from 0 to 20 and get satisfactory results, but I can't seem to read an input voltage (0 to 5V from a 5K pot) with the same success.

If my A/D converter is defaulting to 8bit read, how can I change it to read 10bits in my C code?

[PCM programmer]

[sonicfire]

thanks

[sonicfire]

You guys were both dead on! I now understand the scaling factor and that works quite well. The 10bit adc seems to have fixed a lot of problems as well. Thank you.