DP8344 datasheet(132/184 Pages) NSC

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60 Reference Section (Continued)

In the ‘‘Blocked If’’ structure if the

condition is met then all

the

operations between the ‘‘If’’ statement and the ‘‘End if’’

statement are performed

‘‘Blocked If’’ structure

condition then

operation

etc

End if

In the ‘‘Blocked Case’’ structure the

operation preceded by

the equivalent numeric value of the

operand is executed

For example if the

operand’ s value is equal to ‘‘1’’ then the

operation preceded by ‘‘1’’ is executed

‘‘Blocked Case’’ structure

Case

operand of

operation

etc

End case

Two reference tables have been added to the back of the

Instruction Set Reference section The first table Table 6-2

lists all the instructions with their associated T-states Af-

fected Flags and Bus Timing figure numbers in a compact

format The second table Table 6-3 lists all the instructions

in opcode order to facilitate disassembly

TABLE 6-1 Notational Conventions for Instruction Set

Symbol

Represents

Meaning

Length

0 to 255

Unsigned Number

8 Bits

127 to b128

Signed Number

0 to 65535

Unsigned Number

16 Bits

R0 – R31

Source Register

R0 – R31

Destination Register

Rsd

R0 – R31

Combination SourceDestination Register

R0 – R15

Limited Source Register

R0 – R15

Limited Destination Register

rsd

R0 – R15

Limited Combination SourceDestination Register

IW IX IY IZ

Index Register

mIr

Index Register in One of the Following Address Modes

Irb

Post Decrement

No Change

Ira

Post Increment

Pre-Increment

0 – 7

Shift Field

3 Bits

0 – 7

Mask Field

3 Bits

0 – 7

Position Field

3 Bits

0 – 1

State Field

1 Bit

0 – 7

Flag Reference Field

3 Bits

Condition Code Instruction Extensions

0 – 63

Vector Field

6 Bits

0 – 3

Global Interrupt Enable Flag GIE Status Control

2 Bits

0 – 1

Global Interrupt Enable Flag GIE Limited Status Control

1 Bit

0 – 1

1 Bit

0 – 1

1 Bit

0 – 1

1 Bit

132

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