Canon EOS 80D - Manual (Page 115)

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f : Selecting the AF OperationN
By default, the AF points light up in red when focus is achieved in low-
light conditions. In Creative Zone modes, you can set whether to have
the AF points light up in red when focus is achieved.
Under low-light conditions, when you press the shutter button halfway,
the built-in flash may fire a brief burst of flashes. This illuminates the
subject to help autofocusing.
AF Points Lighting Up in Red
AF-Assist Beam with the Built-in Flash
 AF-assist beam will not be emitted from the built-in flash in <7> or
<8: 35> modes, or when [Built-in flash firing] is set to <b> in
<A>, <C>, <8: PCF24>, or <v: GWXHcZ> modes.
 The AF-assist beam will not be emitted with AI Servo AF operation.
 The built-in flash makes a sound when firing continuously. This is normal
and not a malfunction.
 The effective range of the AF-assist beam emitted by the built-in flash is
approx. 4 meters / 13.1 feet.
 In Creative Zone modes, when you raise the built-in flash with the <I>
button, the AF-assist beam will fire when necessary. Note that depending
on the setting for [8C.Fn II-6: AF-assist beam firing], the AF-assist
beam may not be emitted.