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257
Chapter 5 Interrupt
The register save operation performed in an interrupt sequence differs depending on whether the con-
tent of the stack pointer (SP)
*1
is an even or an odd number when an interrupt request is acknowledged.
If the stack pointer (SP)
*1
indicates an even number, the contents of the flag register (FLG) and program
counter (PC) each are saved simultaneously all 16 bits together. If the stack pointer indicates an odd
number, the register contents each are saved in two operations 8 bits at a time. Figure 5.3.3 shows how
registers are saved in each case.
*1 Stack pointer indicated by the U flag.
(1) When stack pointer (SP) contains an even number
Address
(2) When stack pointer (SP) contains an odd number
Stack area Stack area
Sequence in which order
registers are saved
Sequence in which order
registers are saved
Address
Finished saving registers
in two operations.
Finished saving registers in
four operations.
(3)
(4)
(1)
(2)
Saved
separately, 8
bits at a time
(1) Saved simul-
taneously, all 16
bits together
(2) Saved simul-
taneously, all 16
bits together
*
[SP] denotes the initial value of the stack pointer (SP) when interrupt request is acknowledged.
After the microcomputer finishes saving registers, the SP content is [SP] minus 4.
[SP]–5
(Odd address)
[SP]–4
(Even address)
[SP]–3
(Odd address)
[SP]–2
(Even address)
[SP]–1
(Odd address)
[SP]
(Even address)
[SP]–5
(Even address)
[SP]–4
(Odd address)
[SP]–3
(Even address)
[SP]–2
(Odd address)
[SP]–1
(Even address)
[SP]
(Odd address)
Program counter (PC
L
)
Program counter (PC
M
)
Flag register (FLG
L
)
Flag register
(FLG
H
)
Program counter
(PC
H
)
Program counter (PC
L
)
Program counter (PC
M
)
Flag register (FLG
L
)
Program counter
(PC
H
)
Flag register
(FLG
H
)
Figure 5.3.3 Operations to save registers
5.3 Interrupt Sequence
- To our customers 1
- M16C/60, M16C/20, M16C/Tiny 3
- Using This Manual 5
- M16C Family Documents 6
- Table of Contents 7
- Quick Reference-1 9
- Quick Reference-2 10
- Quick Reference-3 11
- Quick Reference by Function 11
- Quick Reference-4 12
- Quick Reference-5 13
- Quick Reference-6 14
- Quick Reference-7 15
- Quick Reference-8 16
- Quick Reference-9 17
- Quick Reference-10 18
- Chapter 1 19
- Overview 19
- Chapter 1 Overview 20
- 1.1.2 Speed performance 20
- 1.2 Address Space 21
- 1.3 Register Configuration 22
- 1.4 Flag Register (FLG) 24
- 1.4.11 Bit 15: Reserved area 25
- 1.5 Register Bank 26
- 1.7 Data Types 28
- 1.7.2 Decimal 29
- 1.7.3 Bits 30
- 1.7.4 String 33
- 1.8 Data Arrangement 34
- 1.9 Instruction Format 36
- 1.10 Vector Table 37
- 1.10.2 Variable Vector Table 38
- Chapter 2 39
- Addressing Modes 39
- 2.1 Addressing Modes 40
- 2.2 Guide to This Chapter 41
- Chapter 2 Addressing Modes 42
- Chapter 3 51
- Functions 51
- 3.1 Guide to This Chapter 52
- (3) Syntax 53
- Unconditional jump 56
- Absolute value 57
- Add with carry 58
- ADCF ADCF 59
- Add without carry 60
- ADJNZ ADJNZ 62
- Logically AND 63
- BAND BAND 65
- Clear bit 66
- Bit Move Condition 67
- Logically AND inverted bits 68
- BNOR BNOR 69
- BNOTBNOT 70
- BNTST BNTST 71
- Exclusive OR inverted bits 72
- Logically OR bits 73
- Debug interrupt 74
- BSET BSET 75
- BTST BTST 76
- BTSTC BTSTC 77
- BTSTS BTSTS 78
- Exclusive OR bits 79
- Compare 80
- DADC DADC 82
- DADD DADD 83
- Decrement 84
- Signed divide 85
- DIVU DIVU 86
- DIVX DIVX 87
- DSBB DSBB 88
- DSUB DSUB 89
- ENTER ENTER 90
- EXITD EXITD 91
- EXTS EXTS 92
- Clear flag register bit 93
- FSET FSET 94
- Increment 95
- Interrupt by INT instruction 96
- INTO INTO 97
- Jump on condition 98
- Unconditional jump 99
- JMPI JMPI 100
- JMPS JMPS 101
- Subroutine call 102
- Indirect subroutine call 103
- JSRS JSRS 104
- Transfer to control register 105
- LDCTX LDCTX 106
- Chapter 3 Functions 107
- LoaD from EXtra far data area 107
- LDINTB LDINTB 108
- LDIPL LDIPL 109
- Transfer 110
- Chapter 3 Functions 111
- MOVA MOVA 112
- Transfer 4-bit data 113
- Signed multiply 114
- MULU MULU 115
- Two’s complement 116
- No operation 117
- Invert all bits 118
- ________ 118
- Logically OR 119
- Restore register/memory 121
- POPC POPC 122
- POPM POPM 123
- PUSH PUSH 124
- PUSHA PUSHA 125
- PUSHC PUSHC 126
- PUSHM PUSHM 127
- REIT REIT 128
- RMPA RMPA 129
- ROLC ROLC 130
- RORC RORC 131
- Return from subroutine 133
- Subtract with borrow 134
- SBJNZ SBJNZ 135
- Shift arithmetic 136
- Shift logical 137
- SMOVB SMOVB 138
- SMOVF SMOVF 139
- SSTR SSTR 140
- STore from Control register 141
- STCTX STCTX 142
- STore to EXtra far data area 143
- STNZ STNZ 144
- Conditional transfer 145
- STZX STZX 146
- Subtract without borrow 147
- UNDefined instruction 150
- WAIT WAIT 151
- XCHG XCHG 152
- Exclusive OR 153
- Chapter 4 155
- 4.1 Guide to This Chapter 156
- Chapter 4 Instruction Code 157
- (1) Mnemonic 157
- (2) Syntax 157
- (3) Instruction code 157
- (4) Table of cycles 157
- (1) ABS.size dest 158
- (1) ADC.size #IMM, dest 158
- (2) ADC.size src, dest 159
- (1) ADCF.size dest 160
- (1) ADD.size:G #IMM, dest 160
- (2) ADD.size:Q #IMM, dest 161
- (3) ADD.B:S #IMM8, dest 162
- (4) ADD.size:G src, dest 163
- (6) ADD.size:G #IMM, SP 164
- (5) ADD.B:S src, R0L/R0H 164
- (7) ADD.size:Q #IMM, SP 165
- (1) AND.size:G #IMM, dest 167
- (2) AND.B:S #IMM8, dest 167
- (3) AND.size:G src, dest 168
- (4) AND.B:S src, R0L/R0H 169
- (1) BAND src 170
- (1) BCLR:G dest 170
- (2) BCLR:S bit, base:11[SB] 171
- (1) BNAND src 173
- (1) BNOR src 174
- (1) BNOT:G dest 174
- (2) BNOT:S bit, base:11[SB] 175
- (1) BNTST src 175
- (1) BNXOR src 176
- (1) BOR src 176
- (1) BSET:G dest 177
- (2) BSET:S bit, base:11[SB] 178
- (1) BTST:G src 178
- (2) BTST:S bit, base:11[SB] 179
- (1) BTSTC dest 179
- (1) BTSTS dest 180
- (1) BXOR src 180
- (1) CMP.size:G #IMM, dest 181
- (2) CMP.size:Q #IMM, dest 182
- (3) CMP.B:S #IMM8, dest 183
- (4) CMP.size:G src, dest 184
- (5) CMP.B:S src, R0L/R0H 185
- (1) DADC.B #IMM8, R0L 185
- (2) DADC.W #IMM16, R0 186
- (3) DADC.B R0H, R0L 186
- (4) DADC.W R1, R0 187
- (1) DADD.B #IMM8, R0L 187
- (2) DADD.W #IMM16, R0 188
- (3) DADD.B R0H, R0L 188
- (4) DADD.W R1, R0 189
- (1) DEC.B dest 189
- (2) DEC.W dest 190
- (1) DIV.size #IMM 190
- (2) DIV.size src 191
- (1) DIVU.size #IMM 191
- (2) DIVU.size src 192
- (1) DIVX.size #IMM 192
- (2) DIVX.size src 193
- (1) DSBB.B #IMM8, R0L 193
- (2) DSBB.W #IMM16, R0 194
- (3) DSBB.B R0H, R0L 194
- (4) DSBB.W R1, R0 195
- (1) DSUB.B #IMM8, R0L 195
- (2) DSUB.W #IMM16, R0 196
- (3) DSUB.B R0H, R0L 196
- (4) DSUB.W R1, R0 197
- (1) ENTER #IMM8 197
- (1) EXITD 198
- (1) EXTS.B dest 198
- (2) EXTS.W R0 199
- (1) FCLR dest 199
- (1) FSET dest 200
- (1) INC.B dest 200
- (2) INC.W dest 201
- (1) INT #IMM 201
- (1) INTO 202
- (1) JMP.S label 203
- (2) JMP.B label 204
- (3) JMP.W label 204
- (1) JMPI.W src 205
- (4) JMP.A label 205
- (2) JMPI.A src 206
- (1) JMPS #IMM8 206
- (1) JSR.W label 207
- (2) JSR.A label 207
- (1) JSRI.W src 208
- (2) JSRI.A src 208
- (1) JSRS #IMM8 209
- (1) LDC #IMM16, dest 209
- (2) LDC src, dest 210
- (1) LDCTX abs16, abs20 210
- (1) LDE.size abs20, dest 211
- (2) LDE.size dsp:20[A0], dest 211
- (3) LDE.size [A1A0], dest 212
- (1) LDINTB #IMM 212
- (1) LDIPL #IMM 213
- (1) MOV.size:G #IMM, dest 213
- (2) MOV.size:Q #IMM, dest 214
- (3) MOV.B:S #IMM8, dest 215
- (4) MOV.size:S #IMM, dest 216
- (5) MOV.B:Z #0, dest 216
- (6) MOV.size:G src, dest 217
- (7) MOV.B:S src, dest 218
- (8) MOV.B:S R0L/R0H, dest 218
- (9) MOV.B:S src, R0L/R0H 219
- (1) MOVA src, dest 220
- R0L, dest 221
- (1) MUL.size #IMM, dest 223
- (2) MUL.size src, dest 224
- (1) MULU.size #IMM, dest 225
- (2) MULU.size src, dest 226
- (1) NEG.size dest 227
- (2) NOT.B:S dest 228
- (1) NOT.size:G dest 228
- (1) OR.size:G #IMM, dest 229
- (2) OR.B:S #IMM8, dest 229
- (3) OR.size:G src, dest 230
- (4) OR.B:S src, R0L/R0H 231
- (1) POP.size:G dest 231
- (2) POP.B:S dest 232
- (3) POP.W:S dest 232
- (1) POPC dest 233
- (1) POPM dest 233
- (1) PUSH.size:G #IMM 234
- (2) PUSH.size:G src 234
- (3) PUSH.B:S src 235
- (4) PUSH.W:S src 235
- (1 ) PUSHA src 236
- (1) PUSHC src 236
- (1) PUSHM src 237
- (1) REIT 237
- (1) RMPA.size 238
- (1) ROLC.size dest 238
- (1) RORC.size dest 239
- (1) ROT.size #IMM, dest 240
- (2) ROT.size R1H, dest 241
- (1) SBB.size #IMM, dest 242
- (2) SBB.size src, dest 243
- (1) SHA.size #IMM, dest 245
- (2) SHA.size R1H, dest 246
- (3) SHA.L #IMM, dest 246
- (4) SHA.L R1H, dest 247
- (1) SHL.size #IMM, dest 248
- (2) SHL.size R1H, dest 249
- (3) SHL.L #IMM, dest 249
- (4) SHL.L R1H, dest 250
- (1) SMOVB.size 250
- (1) SMOVF.size 251
- (1) SSTR.size 251
- (1) STC src, dest 252
- (2) STC PC, dest 252
- (1) STE.size src, abs20 253
- (1) STCTX abs16, abs20 253
- (2) STE.size src, dsp:20[A0] 254
- (3) STE.size src, [A1A0] 254
- (1) STNZ #IMM8, dest 255
- (1) STZ #IMM8, dest 255
- (1) STZX #IMM81, #IMM82, dest 256
- (1) SUB.size:G #IMM, dest 256
- (2) SUB.B:S #IMM8, dest 257
- (3) SUB.size:G src, dest 258
- (4) SUB.B:S src, R0L/R0H 259
- (1) TST.size #IMM, dest 259
- (2) TST.size src, dest 260
- (1) WAIT 261
- (1) XCHG.size src, dest 262
- (1) XOR.size #IMM, dest 263
- (2) XOR.size src, dest 264
- Chapter 5 265
- Interrupt 265
- Chapter 5 Interrupt 267
- 5.1.2 Software Interrupts 267
- ____________ 268
- 5.2 Interrupt Control 269
- 5.3 Interrupt Sequence 272
- 5.3.3 Saving Registers 274
- 5.5 Interrupt Priority 277
- 5.6 Multiple Interrupts 278
- 5.7.1 Reading address 0000016 280
- 5.7.2 Setting the SP 280
- Chapter 6 283
- Calculation Number of Cycles 283
- Calculation number of cycles 285
- Q & A 289
- Q&A-2 290
- Q&A-3 291
- Q&A-4 292
- Q&A-5 293
- Q&A-6 294
- Glossary 295
- Glossary-2 296
- Glossary-3 297
- Glossary-4 298
- Table of symbols 299
- Symbol-2 300
- REVISION HISTORY 303
- Software Manual 308
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