TSC80251 TEMIC [TEMIC Semiconductors], TSC80251 Datasheet - Page 8

• Manufacturer Part Number: TSC80251
• Manufacturer: TEMIC [TEMIC Semiconductors]

Rev. C – May 7, 1999
Conventions
The following notations and terminology are used in this manual. The Glossary defines all terms with special meanings.
#
italics
XXXX
Assert and Deassert The terms Assert and Deassert refer to the act of making a signal active
Instructions
Logic 0 (Low)
Logic 1 (High)
Numbers
Register Bits
The pound symbol (#) has either of two meanings, depending on the context.
When used with a signal name, the symbol means that the signal is active
low. When used in an instruction, the symbol prefixes an immediate value
in immediate addressing mode.
Italics identify variables and introduce new terminology. The context in
which italics are used distinguishes between 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.y, x represents the variable that identifies the
specific port, and y represents the register bit variable [7:0]. Variables must
be replaced with the correct values when configuring or programming
registers or identifying signals.
Uppercase X (no italics) represents an unknown value or a “don’t care” state
or condition. The value may be either binary or hexadecimal, depending on
the context. For example, 2XAFh (hex) indicates that bits 11:8 are unknown;
10XXb in binary context indicates that the two Least Significant Bits are
unknown.
(enabled) and inactive (disabled), respectively. The active polarity
(high/low) is defined by the signal name. Active–low signals are designated
by a pound symbol (#) suffix; active–high signals have no suffix. To assert
RD# is to drive it low; to assert ALE is to drive it high; to deassert RD# is
to drive it high; to deassert ALE is to drive it low.
Instruction mnemonics are shown in upper case to avoid confusion. You may
use either upper case or lower case.
An input voltage level equal to or less than the maximum value of V
output voltage level equal to or less than the maximum value of V
Product Datasheet for values.
An input voltage level equal to or greater than the minimum value of V
an output voltage level equal to or greater than the minimum value of V
See Product Datasheet for values.
Hexadecimal numbers are represented by a string of hexadecimal digits
followed by the letter h. Decimal and binary numbers are represented by
their customary notations: i.e. 255 is a decimal number and 1111 1111 is a
binary number. In most cases of binary numbers, the letter b is added for
clarity.
Bit locations are indexed by 7:0 for byte registers, 15:0 for word registers,
and 31:0 for double word (dword) registers. Bit 0 is the least significant bit
TSC80251
OL
IL
or an
. See
IH
OH
or
.