Intel 8XC196NP, 80C196NU, Microcontroller manual Uart

8XC196NP, 80C196NU USER’S MANUAL

special-purpose memory	A partition of memory used for storing the interrupt
	vectors, PTS vectors, chip configuration bytes, and
	several reserved locations.
standard interrupt	Any maskable interrupt that is assigned to the
	interrupt controller for processing by an interrupt
	service routine.
state time (or state)	The basic time unit of the device; the combined
	period of the two internal timing signals, PH1 and
	PH2. (The internal clock generator produces PH1 and
	PH2 by halving the frequency of the signal on
	XTAL1. The rising edges of the active-high PH1 and
	PH2 signals generate CLKOUT, the output of the
	internal clock generator.) Because the device can
	operate at many frequencies, this manual defines time
	requirements in terms of state times rather than in
	specific units of time.
t	Lowercase “t” represents the period of the internal
	clock. For the NP, t is the reciprocal of FXTAL1
	(1/FXTAL1, where FXTAL1 is the input frequency on
	XTAL1). For the 80C196NU, which employs a
	phased-lock loop with clock multiplier circuitry, t is
	the reciprocal of either FXTAL1, 2FXTAL1, or 4FXTAL1.
	The multiplier depends on the clock mode, which is
	controlled by the PLLEN1 and PLLEN2 input pins.
	(Figure 2-4 on page 2-8 illustrates the clock circuitry
	of the 80C196NU.)
UART	Universal asynchronous receiver and transmitter. A
	part of the serial I/O port.
WDT	See watchdog timer.
word	Any 16-bit unit of data.
WORD	An unsigned, 16-bit variable with values from 0
	through 216–1.
zero extension	A method for converting data to a larger format by
	filling the upper bit positions with zeros.

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