ARM Technical Support Knowledge Articles

Does the UART PL011 support the 16c750 standard?

Applies to: PL011 UART

Answer

The current UART, PL011 r1p5, does not support the 16c750 standard; it supports the 16c650 
standard with the following variations:

	Receive FIFO trigger levels are 1/8, 1/4, 1/2, 3/4, and 7/8
	Transmit FIFO trigger levels are 1/8, 1/4, 1/2, 3/4, and 7/8
	The internal register map address space and the bit function of each register differ
	The deltas of the modem status signals are not available.

Also, the following 16C650 UART features are not supported:

	1.5 stop bits (1 or 2 stop bits only are supported)
	Independent receive clock.

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