Intel Microcontroller, 80C196NU, 8XC196NP manual Italics

8XC196NP, 80C196NU USER’S MANUAL

italics	Italics identify variables and introduce new terminology. The context
	in which italics are used distinguishes between the two possible
	meanings.
	Variables in registers and signal names are commonly represented by
	x and y, where x represents the first variable and y represents the
	second variable. For example, in register Px_MODE.y, x represents
	the variable that identifies the specific port associated with the
	register, and y represents the register bit variable (7:0 or 15:0).
	Variables must be replaced with the correct values when configuring
	or programming registers or identifying signals.
numbers	Hexadecimal numbers are represented by a string of hexadecimal
	digits followed by the character H. Decimal and binary numbers are
	represented by their customary notations. (That is, 255 is a decimal
	number and 1111 1111 is a binary number. In some cases, the letter B
	is appended to binary numbers for clarity.)
register bits	Bit locations are indexed by 7:0 (or 15:0), where bit 0 is the least-
	significant bit and bit 7 (or 15) is the most-significant bit. An
	individual bit is represented by the register name, followed by a
	period and the bit number. For example, WSR.7 is bit 7 of the
	window selection register. In some discussions, bit names are used.
register names	Register mnemonics are shown in upper case. For example, TIMER2
	is the timer 2 register; timer 2 is the timer. A register name containing
	a lowercase italic character represents more than one register. For
	example, the x in Px_REG indicates that the register name refers to
	any of the port data registers.
reserved bits	Certain bits are described as reserved bits. In illustrations, reserved
	bits are indicated with a dash (—). These bits are not used in this
	device, but they may be used in future implementations. To help
	ensure that a current software design is compatible with future imple-
	mentations, reserved bits should be cleared (given a value of “0”) or
	left in their default states, unless otherwise noted. Do not rely on the
	values of reserved bits; consider them undefined.
signal names	Signal names are shown in upper case. When several signals share a
	common name, an individual signal is represented by the signal name
	followed by a number. For example, the EPA signals are named
	EPA0, EPA1, EPA2, etc. Port pins are represented by the port abbre-
	viation, a period, and the pin number (e.g., P1.0, P1.1); a range of
	pins is represented by Px.y:z (e.g., P1.4:0 represents five port pins:
	P1.4, P1.3, P1.2, P1.1, P1.0). A pound symbol (#) appended to a
	signal name identifies an active-low signal.
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