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Z8018x
Family MPU User Manual
282
UM005003-0703
REQUEST PRIORITY
The Z80180 features three types of requests.
.
Type 1, Type 2, and Type 3 requests priority as follows.
•
Highest priority Type 1 > Type 2 > Type 3 lowest priority
•
Each request priority in Type 2 is shown as follows. highest priority
Bus Req. > Refresh Req. > DMA Request lowest priority
Internal
I/O
Interrupt
Not
acceptable
NMI
Not acceptable
Interrupt
acknowledge
cycle precedes.
NMI
is accepted
after executing
Acceptable
DMA cycle
stops
Acceptable
Return from
SYSTEM
STOP mode
to normal
operation
Note: * Not acceptable when DMA Request is in level-sense.
: Same as above.
MC: Machine Cycle
Table 54. The Z80180 Types of Requests
Type 1 Accepted in specified state WAIT
Type 2 Accepted in each machine cycle Refresh Request, DMA
Request, and Bus Request.
Type 3 Accepted in each instruction Interrupt Request
Table 53. Request Acceptances in Each Operating Mode
Current
Status
Request
Normal
Operation
(CPU mode
and IOSTOP
Mode) WAIT State
Refresh
Cycle
Interrupt
Acknowledge
Cycle DMA Cycle
BUS
RELEASE
Mode
SLEEP
Mode
SYSTEM
STOP
Mode
- Family MPU 1
- MANUAL OBJECTIVES 3
- Intended Audience 3
- Manual Organization 3
- Sections 4
- Appendices 4
- Table of Contents 5
- List of Figures 8
- UM005003-0703 10
- List of Tables 12
- Status Signals 287 14
- FEATURES 16
- GENERAL DESCRIPTION 16
- PIN DESCRIPTION 22
- ARCHITECTURE 27
- OPERATION MODES 30
- 0 and IOC is 0 32
- CPU Timing 33
- Wait State Generator 42
- Bit 7 6 5 4 44
- MWI1 MWI0 MWI1 MWI0 44
- R/W R/W R/W R/W 44
- 1, selecting the 45
- Processors Only) 46
- SLP 2nd Op Code address 50
- Add-On Features 51
- STANDBY Mode 52
- IDLE Mode 55
- STANDBY-QUICK RECOVERY Mode 56
- Internal I/O Registers 56
- –0 Reserved ? ? Reserved 67
- Memory Management Unit (MMU) 69
- Figure 25. MMU Block Diagram 71
- 0 during I/O cycles 72
- MMU Register Description 75
- 0 during RESET 77
- 1 while all bits 78
- 0. The logical 64KB 78
- 0000H to FFFFH) 78
- Interrupts 80
- Interrupt Vector Low Register 81
- 00H during RESET 82
- N/A R/W R/W R/W 83
- 1 by the El (Enable 84
- 00000H was caused by 85
- INT0 Mode 0 90
- INT0 Mode 1 91
- INT0 Mode 2 93
- 00H and 94
- INT1, INT2 95
- 0. Each is also 96
- Family MPU User Manual 100
- Dynamic RAM Refresh Control 101
- TR1 TRW* TR2 102
- DMA Controller (DMAC) 105
- 107
- DMAC Register Description 108
- DMA Register Description 118
- Bits 5–3 119
- Bits 2–0 119
- DMA Operation 119
- Memory to Memory—Channel 0 120
- 00H) transfer 122
- Memory to ASCI - Channel 0 124
- Note: X = Don’t care 125
- T1 T2 T3 T3T2T1 130
- Processors 131
- ASCI Register Description 132
- 08H, 09H) 134
- 1) these pins 149
- 1, then the CKA1/ 149
- 0. Even after the 154
- Figure 56. ASCI Clock 156
- Baud Rate Generator 158
- CSI/O Block Diagram 161
- CSI/O Registers Description 162
- Address = 0BH) 164
- Interrupt Request 166
- = 0) when 167
- PRT Block Diagram 171
- PRT Register Description 172
- 0FH, CHI, 16H, 17H) 174
- Timer Control Register (TCR) 176
- PRT Interrupts 179
- PRT and RESET 179
- Secondary Bus Interface 180
- On-Chip Clock Generator 183
- Miscellaneous 187
- Software Architecture 188
- CPU REGISTERS 190
- Accumulator (A, A') 191
- Flag Registers (F, F') 192
- Interrupt Vector Register (I) 192
- R Counter (R) 192
- Index Registers (IX, and IY) 192
- Stack Pointer (SP) 193
- Program Counter (PC) 193
- Flag Register (F) 193
- Addressing Modes 195
- Implied Register (IMP) 195
- Register Direct (REG) 195
- Register Indirect (REG) 196
- Indexed (INDX) 197
- Extended (EXT) 197
- Immediate (IMMED) 198
- Relative (REL) 198
- IO (I/O) 199
- DC Characteristics 200
- Z80180 DC CHARACTERISTICS 201
- Z8S180 DC CHARACTERISTICS 202
- Z8L180 DC CHARACTERISTICS 204
- AC Characteristics 208
- Timing Diagrams 213
- STANDARD TEST CONDITIONS 221
- Instruction Set 223
- CONDITION 224
- RESTART ADDRESS 225
- MISCELLANEOUS 226
- DATA TRANSFER INSTRUCTIONS 238
- Special Control Instructions 251
- Instruction Summary 253
- Op Code Map 263
- DDH 22H : LD (mn), IX 264
- Bus Control Signal Conditions 267
- INTERRUPTS 295
- Operating Modes Summary 297
- REQUEST PRIORITY 298
- OPERATION MODE TRANSITION 299
- 0000H (all DMA transfers) 301
- Status Signals 303
- PIN STATUS 304
- –A17, A19 — Z 1 A 1 305
- –D7— ZZAZ 305
- INTERNAL I/O REGISTERS 309
- Ch 0 Destination Mode 1,0 315
- ORDERING INFORMATION 319
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