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TSC 80251 Programmer’s Guide

Temic Semiconductors 

Conventions

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The following notations and terminology are used in this manual. The Glossary defines all terms with special meanings.

#

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

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.

XXXX

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.

Assert and Deassert

The terms Assert and Deassert refer to the act of making a signal active

(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.

Instructions

Instruction mnemonics are shown in upper case to avoid confusion. You may

use either upper case or lower case.

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

Product Datasheet 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 Product Datasheet for values.

Numbers

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.

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. Bit 0 is the least significant bit

Rev. C – May 7, 1999

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