COP8-EMFA-68N National Semiconductor, COP8-EMFA-68N Datasheet - Page 52

• Manufacturer Part Number: COP8-EMFA-68N
• Description: EMULATOR NULL TARGET
• Manufacturer: National Semiconductor

Specifications of COP8-EMFA-68N

• Accessory Type: Emulator Null Target
• For Use With/related Products: Cop 8
• Lead Free Status / RoHS Status: Not applicable / Not applicable

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13.0 Instruction Set
13.4.9 No-Operation Instruction
The no-operation instruction does nothing, except to occupy
space in the program memory and time in execution.
Note: The VIS is a special case of the Indirect Transfer of
Control addressing mode, where the double byte vector
associated with the interrupt is transferred from adjacent
addresses in the program memory into the program counter
(PC) in order to jump to the associated interrupt service
routine.
13.5 REGISTER AND SYMBOL DEFINITION
The following abbreviations represent the nomenclature
used in the instruction description and the COP8 cross-
assembler.
A
B
X
If Equal (IFEQ)
If Not Equal (IFNE)
If Greater Than (IFGT)
If Carry (IFC)
If Not Carry (IFNC)
If Bit (IFBIT)
If B Pointer Not Equal (IFBNE)
And Skip if Zero (ANDSZ)
Decrement Register and Skip if Zero (DRSZ)
No-Operation (NOP)
8-Bit Accumulator Register
8-Bit Address Register
8-Bit Address Register
Registers
(Continued)
52
S
SP
PC
PU
PL
C
HC
GIE
VU
VL
[B]
[X]
MD
Mem
Meml
Imm
Reg
Bit
8-Bit Segment Register
8-Bit Stack Pointer Register
15-Bit Program Counter Register
Upper 7 Bits of PC
Lower 8 Bits of PC
1 Bit of PSW Register for Carry
1 Bit of PSW Register for Half Carry
1 Bit of PSW Register for Global Interrupt
Enable
Interrupt Vector Upper Byte
Interrupt Vector Lower Byte
Memory Indirectly Addressed by B Register
Memory Indirectly Addressed by X Register
Direct Addressed Memory
Direct Addressed Memory or [B]
Direct Addressed Memory or [B] or
Immediate Data
8-Bit Immediate Data
Register Memory: Addresses F0 to FF
(Includes B, X and SP)
Bit Number (0 to 7)
Loaded with
Exchanged with
Registers
Symbols