Canon EOS 80D - Manual (Page 159)

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d : Program AE
 If the “30"” shutter speed and the lowest f/number
blink, it indicates underexposure.
Increase the ISO speed or use flash.
 If the “8000” shutter speed and the highest f/number
blink, it indicates overexposure.
Lower the ISO speed or use an ND filter (sold
separately) to reduce the amount of light entering the
lens.
Differences Between <d> and <A> Modes
In the <A> mode, many functions, such as the AF operation and metering
mode, are set automatically to prevent spoiled shots. The functions you can
set are limited. With <d> mode, only the shutter speed and aperture are set
automatically. You can freely set the AF operation, metering mode, and
other functions.
Program Shift
 In the Program AE mode, you can freely change the shutter speed and
aperture combination (Program) set automatically by the camera while
maintaining the same exposure. This is called Program shift.
 To shift the program, press the shutter button halfway, then turn the
<6> dial until the desired shutter speed or aperture is displayed.
 Program shift will be canceled automatically when the metering timer
(0) ends (exposure setting display turns off).
 Program shift cannot be used with flash.