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Z380
™
USER'S MANUAL
ZILOG
DC-8297-03
LDDRW
LOAD, DECREMENT AND REPEAT (WORD)
LDDRW
Operation: repeat until (BC=0) begin
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
end
This instruction is used for block transfers of strings of data. The words of data at the location
addressed by the HL register are loaded into memory starting at the location addressed by
the DE register. The number of words moved is determined by the contents of the BC
register. If the BC register contains zero when this instruction is executed, 65,536 words are
transferred. The effect of decrementing the pointers during the transfer is important if the
source and destination strings overlap with the source string starting at a lower memory
address. Placing the pointers at the highest address of the strings and decrementing the
pointers ensures that the source string is copied without destroying the overlapping area.
This instruction can be interrupted after each execution of the basic operation. The Program
Counter value of the start of this instruction is saved before the interrupt request is
accepted,so that the instruction can be properly resumed.
Flags: S: Unaffected
Z: Unaffected
H: Cleared
V: Cleared
N: Cleared
C: Unaffected
Addressing Execute
Mode Syntax Instruction Format Time Note
LDDRW 11101101 11111000 nX(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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