Terms and abbreviations

WO R K I N G W I T H T H E C P U

System control processor (CP15) registers

31

28

27 26

25

24 23

21

20 19

 

16 15

12

11 10

9

8

7

5

4

3

0

Cond

 

1

1

1

0

Opcode

L

 

CRn

 

Rd

 

1

1

1

1

Opcode

1

 

CRm

 

 

_1

 

 

 

 

_2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1: CP15 MRC and MCR bit pattern

The mnemonics for these instructions are:

MCR{cond} p15,opcode_1,Rd,CRn,CRm,opcode_2

MRC{cond} p15,opcode_1,Rd,CRn,CRm,opcode_2

If you try to read from a write-only register or write to a read-only register, you will have UNPREDICTABLE results. In all instructions that access CP15:

The opcode_1 field SHOULD BE ZERO, except when the values specified are used to select the operations you want. Using other values results in unpredictable behavior.

The opcode_2 and CRm fields SHOULD BE ZERO, except when the values specified are used to select the behavior you want. Using other values results in unpredictable behavior.

This table lists the terms and abbreviations used in the CP15 registers and explanations.

Term

Abbreviation

Description

 

 

For reads:

UNPREDICTABLE

UNP

 

 

The data returned when reading from this location is

 

 

unpredictable, and can have any value.

 

 

For writes:

 

 

Writing to this location causes unpredictable

 

 

behavior, or an unpredictable change in device

 

 

configuration.

 

 

 

UNDEFINED

UND

An instruction that accesses CP15 in the manner

 

 

indicated takes the UNDEFINED instruction

 

 

exception.

 

 

 

SHOULD BE ZERO

SBZ

When writing to this field, all bits of the field

 

 

SHOULD BE ZERO.

 

 

 

SHOULD BE ONE

SBO

When writing to this location, all bits in this field

 

 

SHOULD BE ONE.

 

 

 

SHOULD BE ZERO or

SBZP

When writing to this location, all bits of this field

PRESERVED

 

SHOULD BE ZERO or PRESERVED by writing the

 

 

same value that has been read previously from the

 

 

same field.

 

 

 

84Hardware Reference NS9215

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Digi NS9215 manual Terms and abbreviations, Mnemonics for these instructions are, Term Abbreviation Description, For reads

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