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Z80 Instruction Set UM008007-0715
174
Z80 CPU
User Manual
NEG
Operation
A ← 0 – A
Op Code
NEG
Operands
None.
Description
The contents of the Accumulator are negated (two’s complement). This method is the
same as subtracting the contents of the Accumulator from zero.
The 80h address remains unchanged.
Condition Bits Affected
S is set if result is negative; otherwise, it is reset.
Z is set if result is 0; otherwise, it is reset.
H is set if borrow from bit 4; otherwise, it is reset.
P/V is set if Accumulator was
80h before operation; otherwise, it is reset.
N is set.
C is set if Accumulator was not
00h before operation; otherwise, it is reset.
M Cycles T States 4 MHz E.T.
2 8 (4, 4) 2.00
11 0 01111
ED
01 0 00100
44
Note:
- Z80 Microprocessors 1
- LIFE SUPPORT POLICY 2
- As used herein 2
- Document Disclaimer 2
- Revision History 3
- Table of Contents 4
- List of Figures 10
- User Manual 11
- List of Tables 12
- Architectural Overview 13
- CPU Register 14
- Special-Purpose Registers 14
- General Purpose Registers 15
- Arithmetic Logic Unit 16
- Pin Description 16
- Pin Functions 17
- • Memory read or write 19
- • I/O device read or write 19
- • Interrupt acknowledge 19
- Instruction Fetch 20
- Memory Read Or Write 21
- Input or Output Cycles 22
- Bus Request/Acknowledge Cycle 23
- HALT Exit 26
- Power-Down Acknowledge Cycle 27
- Power-Down Release Cycle 28
- Interrupt Response 29
- CPU Response 31
- Minimum System Hardware 33
- Adding RAM 34
- Memory Speed Control 35
- Example 1 39
- Example 2 39
- Example 3 39
- Example 4 40
- Programming Task Examples 41
- Programming Task Examples 43
- Z80 CPU Instructions 44
- Addressing Modes 46
- Addressing 46
- Register Addressing 49
- Implied Addressing 49
- Register Indirect Addressing 49
- One or Two Bytes 49
- Instruction Op Codes 50
- Load and Exchange 51
- Table 5. 8-Bit Load Group LD 52
- +8 is written as: 53
- Top of stack 56
- • BC is a byte counter 57
- Table 9. Block Search Group 59
- Table 12. 16-Bit Arithmetic 62
- Rotate and Shift 63
- Figure 39. Rotates and Shifts 64
- Bit Manipulation 67
- 3E32h is shown in Figure 40 68
- UM008007-0715 Input/Output 71
- Table 16. Restart Group 71
- Table 17. Input Group 72
- Z80 Instruction Set 75
- Carry Flag 76
- Add/Subtract Flag 76
- Parity/Overflow Flag 77
- Half Carry Flag 78
- Zero Flag 78
- Z80 Instruction Description 79
- 8-Bit Load Group 80
- LD r, r' 81
- 00 r 101 82
- LD r, (HL) 84
- LD r, (IX+d) 85
- LD r, (IY+d) 87
- LD (HL), r 89
- LD (IX+d), r 91
- LD (IY+d), r 93
- LD (HL), n 95
- LD (IX+d), n 96
- LD (IY+d), n 97
- LD A, (BC) 98
- LD A, (DE) 99
- LD A, (nn) 100
- LD (BC), A 101
- LD (DE), A 102
- LD (nn), A 103
- 11 0 01111 104
- 01 1 11100 104
- 01 1 11101 105
- 01 0 11100 106
- 01 0 11101 107
- 16-Bit Load Group 108
- LD dd, nn 109
- LD IX, nn 110
- LD IY, nn 111
- LD HL, (nn) 112
- LD dd, (nn) 113
- LD IX, (nn) 115
- LD IY, (nn) 116
- LD (nn), HL 117
- LD (nn), dd 118
- Z80 Instruction Description 119
- LD (nn), IX 120
- LD (nn), IY 121
- LD SP, HL 122
- LD SP, IX 123
- LD SP, IY 124
- 11 q 011q0 125
- 11 1 01101 127
- 11 0 01110 127
- 11 1 01111 128
- 11 q 010q0 129
- 11 0 01010 131
- EX DE, HL 134
- EX AF, AF′ 135
- 11 1 01001 136
- EX (SP), HL 137
- EX (SP), IX 138
- EX (SP), IY 139
- 10 0 00010 140
- ↔ BC – 1 142
- 10 1 00010 142
- 10 0 00011 144
- 10 1 00011 146
- Condition Bits Affected 147
- 10 1 01010 149
- 10 0 01011 151
- 10 1 01011 152
- 8-Bit Arithmetic Group 154
- ADD A, r 155
- ADD A, n 157
- ADD A, (HL) 158
- ADD A, (IX + d) 159
- ADD A, (IY + d) 160
- ADC A, s 161
- Description 162
- Operation 163
- SBC A, s 165
- 00 r 001 175
- INC (HL) 177
- INC (IX+d) 178
- INC (IY+d) 179
- Control Groups 182
- 00 0 11110 183
- 00 0 11111 185
- 01 0 00100 186
- 10 1 00001 187
- 01 0 00011 187
- 00 1 11111 188
- 00 1 11110 189
- 00 0 00000 190
- 01 1 10110 191
- 11 1 11010 192
- 11 1 11011 193
- 01 0 10100 194
- 01 1 10100 195
- 01 1 10101 196
- 16-Bit Arithmetic Group 197
- ADD HL, ss 198
- ADC HL, ss 200
- SBC HL, ss 202
- ADD IX, pp 204
- ADD IY, rr 206
- 00 s 110s0 208
- 00 0 11010 209
- 00 s 110s1 211
- 00 0 11011 212
- Rotate and Shift Group 214
- 00 0 11100 215
- 00 1 11100 217
- 00 0 11101 219
- 00 1 11101 221
- 11 0 11001 223
- RLC (HL) 225
- and the Carry 226
- RLC (IX+d) 227
- RLC (IY+d) 229
- 10 0 11101 232
- 76 4 10253 232
- 00 1 10101 233
- 00 1 01010 235
- 001010 01 236
- 101110 11 238
- 011101 10 239
- 01 0 10010 242
- 001110 11 245
- 01 0 11111 248
- 01 0 11110 250
- BIT b, r 253
- BIT b, (HL) 255
- BIT b, (IX+d) 257
- BIT b, (IY+d) 259
- SET b, r 261
- SET b, (HL) 263
- SET b, (IX+d) 265
- SET b, (IY+d) 266
- RES b, m 268
- Jump Group 270
- 11 0 11000 271
- JP cc, nn 272
- 00 1 00001 274
- PC after jump 275
- 00 1 00011 276
- JR NC, e 278
- 00 0 00011 280
- JR NZ, e 282
- 11 0 01011 284
- 00 1 00000 287
- Call and Return Group 289
- 11 0 01101 290
- CALL cc, nn 292
- 11 0 01001 294
- 01 0 01101 297
- 01 0 01100 299
- 11 t 111 301
- Input and Output Group 303
- IN A, (n) 304
- IN r (C) 305
- 10 0 10010 307
- 10 1 10010 309
- 10 0 10011 311
- 10 1 10011 313
- OUT (n), A 315
- OUT (C), r 316
- 10 0 11010 318
- 10 1 11010 320
- 10 0 11011 322
- 10 1 11011 324
- Customer Support 326
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