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Conventions

MAC7200 Microcontroller Family Reference Manual, Rev. 2

lxvi

Freescale Semiconductor

Conventions

The following table gives conventions for terms used throughout this document.

Terminology

The following table lists definitions for abbreviations and names used throughout this document

Table i. Conventions

Terms

Description

logic level one

The voltage level that corresponds to a Boolean true (1) state.

logic level zero

The voltage level that corresponds to a Boolean false (0) state.

ACTIVE_HIGH

Names for signals that are active high are shown in uppercase text without an overbar. Signals

that are active high are referred to as asserted when they are logic 1 and negated when they

are logic 0.

ACTIVE_LOW

A bar over a signal name indicates that the signal is active low. Active-low signals are referred

to as asserted when they are logic 0 and negated when they are logic 1.

asserted

Signal is in the active logic state. In active high logic, the signal is asserted when it changes to

logic level one; in active low logic, the signal is asserted when it changes to logic zero.

negated

Signal is in the inactive logic state. In active high logic, the signal is negated when it changes to

logic level zero; in active low logic, the signal is negated when it changes to logic level one.

set

To establish logic level one on a bit or bits

clear

To establish logic level zero on a bit or bits

0x0000

Hexadecimal numbers

0b0000

Binary numbers

Indicates a numeric place holder. In register field contexts, indicates a value that may be written

or read. In register names, indicates any one of a set of multiple, identical registers. For

example, UCCRn indicates a reference to any one of the eMIOS Channel Control Registers,

UCCR0 through UCCR15.

In certain contexts, such as bit or signal encoding, this indicates a don’t care. For example, if a

four-bit binary field is represented as 0bx001, the state of the first bit is a don’t care. In other

contexts, such as module or register names, this is a place holder for a letter to designate a

module instantiation. For example, eSCI_x indicates a reference to either eSCI_A or eSCI_B.

Bit place holder

Byte

8 bits

Half-word

16 bits

Word

32 bits

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