dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 132

• Manufacturer Part Number: dp8344b
• Description: Biphase Communications Processor?bcp
• Manufacturer: National Semiconductor Corporation

operation preceded by ‘‘1 ’’ is executed
6 0 Reference Section
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
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
n
nn
Rs
Rd
Rsd
rs
rd
rsd
Ir
mIr
b
m
p
s
f
cc
v
g
g
rf
ba
bb
Symbol
If condition then
End if
operation
operation
etc
0 to 255
0 to 65535
R0 – R31
R0 – R31
R0 – R31
R0 – R15
R0 – R15
R0 – R15
IW IX IY IZ
Ir
Ir
Ir
0 – 7
0 – 7
0 – 7
0 – 1
0 – 7
0 – 63
0 – 3
0 – 1
0 – 1
0 – 1
0 – 1
a
a
Represents
b
a
127 to
Ir
b
128
TABLE 6-1 Notational Conventions for Instruction Set
(Continued)
Unsigned Number
Signed Number
Unsigned Number
Source Register
Destination Register
Combination Source Destination Register
Limited Source Register
Limited Destination Register
Limited Combination Source Destination Register
Index Register
Index Register in One of the Following Address Modes
Shift Field
Mask Field
Position Field
State Field
Flag Reference Field
Condition Code Instruction Extensions
Vector Field
Global Interrupt Enable Flag GIE Status Control
Global Interrupt Enable Flag GIE Limited Status Control
Register Bank and ALU Flag Status Control
Register Bank A Select
Register Bank B Select
Post Decrement
No Change
Post Increment
Pre-Increment
132
‘‘Blocked Case’’ structure
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
Meaning
Case operand of
End case
0 operation
1 operation
2 etc
Length
16 Bits
8 Bits
3 Bits
3 Bits
3 Bits
3 Bits
6 Bits
2 Bits
1 Bit
1 Bit
1 Bit
1 Bit
1 Bit