Intel Embedded Microcontroller, 8XC251SA, 8XC251SP, 8XC251SQ, 8XC251SB manual Instructions

8XC251SA, SB, SP, SQ USER’S MANUAL

Instructions	Instruction mnemonics are shown in upper case to avoid confusion.
	When writing code, either upper case or lower case may be used.
Logic 0 (Low)	An input voltage level equal to or less than the maximum value of
	VIL or an output voltage level equal to or less than the maximum
	value of VOL. See data sheet for values.
Logic 1 (High)	An input voltage level equal to or greater than the minimum value of
	VIH or an output voltage level equal to or greater than the minimum
	value of VOH. See data sheet for values.
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 added for clarity.
Register Bits	Bit locations are indexed by 7:0 for byte registers, 15:0 for word
	registers, and 31:0 for double-word (dword) registers, where bit 0 is
	the least-significant bit and 7, 15, or 31 is the most-significant bit. An
	individual bit is represented by the register name, followed by a
	period and the bit number. For example, PCON.4 is bit 4 of the
	power control register. In some discussions, bit names are used. For
	example, the name of PCON.4 is POF, the power-off flag.
Register Names	Register names are shown in upper case. For example, PCON is the
	power control register. If a register name contains a lowercase
	character, it represents more than one register. For example,
	CCAPMx represents the five registers: CCAPM0 through CCAPM4.
Reserved Bits	Some registers contain reserved bits. These bits are not used in this
	device, but they may be used in future implementations. Do not write
	a “1” to a reserved bit. The value read from a reserved bit is indeter-
	minate.
Set and Clear	The terms set and clear refer to the value of a bit or the act of giving
	it a value. If a bit is set, its value is “1;” setting a bit gives it a “1”
	value. If a bit is clear, its value is “0;” clearing a bit gives it a “0”
	value.
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. Port pins are represented by the port abbrevi-
	ation, a period, and the pin number (e.g., P0.0, P0.1). A pound
	symbol (#) appended to a signal name identifies an active-low signal.

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