NSC800 Datasheet, PDF (28/76 Pages) National Semiconductor (TI) – NSC800TM High-Performance Low-Power CMOS Microprocessor

12 0 Instruction Set
This section details the entire NSC800 instruction set in
terms of
 Opcode
 Instruction
 Function
 Timing
 Addressing Mode
The instructions are grouped in order under the following
functional headings
 8-Bit Loads
 16-Bit Loads
 8-Bit Arithmetic
 16-Bit Arithmetic
 Bit Set Reset and Test
 Rotate and Shift
 Exchanges
 Memory Block Moves and Searches
 Input Output
 CPU Control
 Program Control
12 1 Instruction Set Index
Alphabetical
Assembly
Mnemonic
Operation
ADC A m₁
ADC A n
ADC A r
ADC HL pp
ADD A m₁
ADD A n
ADD A r
ADD HL pp
ADD IX pp
ADD IY pp
ADD ss pp
AND m₁
AND n
AND r
Add with carry memory location contents to Accumulator
Add with carry immediate data n to Accumulator
Add with carry register r contents to Accumulator
Add with carry register pair pp to HL
Add memory location contents to Accumulator
Add immediate data n to Accumulator
Add register r contents to Accumulator
Add register pair pp to HL
Add register pair pp to IX
Add register pair pp to IY
Add register pair pp to contents of register pair ss
Logical ‘AND’ memory contents to Accumulator
Logical ‘AND’ immediate data to Accumulator
Logical ‘AND’ register r contents to Accumulator
BIT b m₁
BIT b r
Test bit b of location m₁
Test bit b of register r
CALL cc nn
CALL nn
CCF
CP m₁
CP n
CP r
CPD
CPDR
CPI
CPIR
CPL
Call subroutine at location nn if condition cc is true
Unconditional call to subroutine at location nn
Complement carry flag
Compare memory contents with Accumulator
Compare immediate data n with Accumulator
Compare register r to contents with Accumulator
Compare location (HL) and Accumulator decrement HL and BC
Compare location (HL) and Accumulator decrement HL and BC
repeat until BC e 0
Compare location (HL) and Accumulator increment HL decrement BC
Compare location (HL) and Accumulator increment HL decrement BC
repeat until BC e 0
Complement Accumulator (1’s complement)
DAA
DEC m₁
DEC r
DEC rr
Decimal adjust Accumulator
Decrement data in memory location m₁
Decrement register r contents
Decrement register pair rr contents
Page
40
38
36
43
40
38
36
43
43
43
43
41
39
36
45
44
56
56
38
42
40
37
50
51
50
51
37
38
42
37
44
28