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Z380
™
USER'S MANUAL
ZILOG
DC-8297-03
LDDW
LOAD AND DECREMENT (WORD)
LDDW
Operation: if (LW) then begin
(DE) ← (HL)
(DE+1) ← (HL+1)
(DE+2) ← (HL+2)
(DE+3) ← (HL+3)
DE ← DE – 4
HL ← HL – 4
BC(15-0) ← BC(15-0) – 4
end
else begin
(DE) ← (HL)
(DE+1) ← (HL+1)
DE ← DE – 2
HL ← HL – 2
BC(15-0) ← BC(15-0) – 2
end
This instruction is used for block transfers of words of data. The word of data at the location
addressed by the HL register is loaded into the location addressed by the DE register. Both
the DE and HL registers are then decremented by two or four, thus moving the pointers to
the preceeding words in the array. The BC register, used as a byte counter, is then
decremented by two or four.
Both DE and HL should be even, to allow word transfers on the bus. BC must be even,
transferring an even number of bytes, or the operation is undefined.
Flags: S: Unaffected
Z: Unaffected
H: Cleared
V: Set if the result of decrementing BC is not equal to zero; cleared otherwise
N: Cleared
C: Unaffected
Addressing Execute
Mode Syntax Instruction Format Time Note
LDDW 11101101 11101000 3+r+w L
- Z80380 CPU 1
- 'S MANUAL 1
- CHAPTER 1 3
- 1.1 INTRODUCTION (Continued) 4
- 1.2 CPU ARCHITECTURE 5
- 1.2.1 Modes of Operation 5
- 1.2.2 Address Spaces 5
- 1.2.3 Data Types 6
- 1.2.4. Addressing Modes 6
- 1.2.5. Instruction Set 6
- 1.2.6 Exception Conditions 6
- 1.3.1 High Throughput 7
- (Continued) 8
- 1.4 SUMMARY 8
- SER'S MANUAL 10
- 2.4 MEMORY ADDRESS SPACE 12
- USER'S MANUAL 15
- DC-8297-03 15
- CHAPTER 2 16
- CHAPTER 3 23
- 3.2 DECODER DIRECTIVES 24
- CHAPTER 4 26
- 4.2.3 Indirect Register (IR) 27
- 4.2.4 Direct Address (DA) 28
- 4.2.5 Indexed (X) 29
- 4.3 DATA TYPES 34
- CHAPTER 5 35
- 5.2.7 Condition Codes 37
- SWAP, and PUSH/POP Group 41
- 5.5.8 Program Control Group 46
- 5.5.11 CPU Control Group 50
- 5.5.12 Decoder Directives 51
- 5.7 EXECUTION TIME 52
- ADD WITH CARRY (BYTE) 54
- ADD WITH CARRY (WORD) 55
- ADD (BYTE) 57
- ADD (WORD) 58
- ADD TO STACK POINTER (WORD) 59
- AND (BYTE) 61
- AND (WORD) 62
- BIT TEST 63
- BANK TEST 64
- CALL RELATIVE 66
- COMPLEMENT CARRY FLAG 67
- COMPARE (BYTE) 68
- COMPARE (WORD) 69
- COMPARE AND DECREMENT (BYTE) 70
- COMPARE AND INCREMENT (BYTE) 72
- COMPLEMENT ACCUMULATOR 74
- COMPLEMENT HL REGISTER (WORD) 75
- DECIMAL ADJUST ACCUMULATOR 76
- DECODER DIRECTIVE 77
- DECREMENT (BYTE) 78
- DECREMENT (WORD) 79
- DISABLE INTERRUPTS 80
- DIVIDE UNSIGNED (WORD) 81
- ENABLE INTERRUPTS 83
- EXCHANGE REGISTER (WORD) 86
- EXCHANGE WITH ACCUMULATOR 89
- EXTEND SIGN (BYTE) 91
- EXTEND SIGN (WORD) 92
- INTERRUPT MODE SELECT 97
- INPUT (BYTE) 98
- INPUT (WORD) 99
- INPUT ACCUMULATOR 100
- INPUT (FROM PAGE 0) 101
- INCREMENT (BYTE) 104
- INCREMENT (WORD) 105
- INPUT AND DECREMENT (BYTE) 106
- INPUT AND DECREMENT (WORD) 107
- INPUT AND INCREMENT (BYTE) 110
- INPUT AND INCREMENT (WORD) 111
- JUMP RELATIVE 115
- LOAD ACCUMULATOR 116
- LOAD IMMEDIATE (BYTE) 117
- LOAD IMMEDIATE (WORD) 118
- LOAD REGISTER (BYTE) 120
- LOAD REGISTER (WORD) 121
- LOAD STACK POINTER 123
- LOAD I REGISTER (WORD) 126
- LOAD CONTROL REGISTER (BYTE) 127
- LOAD AND DECREMENT (BYTE) 130
- LOAD AND DECREMENT (WORD) 131
- LOAD AND INCREMENT (BYTE) 134
- LOAD AND INCREMENT (WORD) 135
- MULTIPLY UNSIGNED (BYTE) 138
- MODE TEST 139
- MULTIPLY (WORD) 140
- MULTIPLY UNSIGNED (WORD) 141
- NEGATE ACCUMULATOR 142
- NEGATE HL REGISTER (WORD) 143
- NO OPERATION 144
- OR (BYTE) 145
- OR (WORD) 146
- OUTPUT DECREMENT MEMORY 147
- OUTPUT INCREMENT MEMORY 151
- OUTPUT (BYTE) 155
- OUTPUT (WORD) 156
- OUTPUT ACCUMULATOR 157
- OUTPUT (TO PAGE 0) 158
- OUTPUT AND DECREMENT (BYTE) 161
- OUTPUT AND DECREMENT (WORD) 162
- OUTPUT AND INCREMENT (BYTE) 163
- OUTPUT AND INCREMENT (WORD) 164
- POP ACCUMULATOR 165
- POP CONTROL REGISTER 166
- POP REGISTER 167
- PUSH ACCUMULATOR 168
- PUSH CONTROL REGISTER 169
- PUSH IMMEDIATE 170
- PUSH REGISTER 171
- RESET BIT 172
- RESET CONTROL BIT 173
- RETURN FROM BREAKPOINT 175
- RETURN FROM INTERRUPT 176
- ROTATE LEFT (BYTE) 178
- ROTATE LEFT (WORD) 179
- ROTATE LEFT (ACCUMULATOR) 180
- ROTATE LEFT CIRCULAR (BYTE) 181
- ROTATE LEFT CIRCULAR (WORD) 182
- ROTATE LEFT DIGIT 184
- ROTATE RIGHT (BYTE) 185
- ROTATE RIGHT (WORD) 186
- ROTATE RIGHT (ACCUMULATOR) 187
- ROTATE RIGHT CIRCULAR (BYTE) 188
- ROTATE RIGHT CIRCULAR (WORD) 189
- ROTATE RIGHT DIGIT 191
- SUBTRACT WITH CARRY (BYTE) 193
- SUBTRACT WITH CARRY (WORD) 194
- SET CARRY FLAG 196
- SET CONTROL BIT 198
- SHIFT LEFT ARITHMETIC (BYTE) 199
- SHIFT LEFT ARITHMETIC (WORD) 200
- SHIFT RIGHT ARITHMETIC (BYTE) 202
- SHIFT RIGHT ARITHMETIC (WORD) 203
- SHIFT RIGHT LOGICAL (BYTE) 204
- SHIFT RIGHT LOGICAL (WORD) 205
- SUBTRACT (BYTE) 206
- SUBTRACT (WORD) 207
- TEST (BYTE) 211
- TEST I/O PORT 212
- EXCLUSIVE OR (BYTE) 213
- EXCLUSIVE OR (WORD) 214
- CHAPTER 6 215
- 6.2 INTERRUPTS (Continued) 216
- 6.2.2 Interrupt Control 216
- 6.3 TRAP INTERRUPT 218
- 6.7 RETI INSTRUCTION 220
- CHAPTER 7 222
- APPENDIX A 225
- APPENDIX B 228
- APPENDIX C 243
- APPENDIX D 258
- APPENDIX E 262
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