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Z8
®
CPU
User Manual
UM001604-0108 External Interface
135
clock is shown for clarity only and does not have a specific timing relationship with other
signals.
Figure 126. External Instruction Fetch or Memory Read Cycle
Machine Cycle
T1
T2*
T3
Clock
A15-A8
AD7–AD0
AS
DS
R/W
DM
Read Cycle
A8-A15
A7–A0
D7–D0 IN
*Port inputs are strobed during T2, which is two internal systems clocks
before the execution cycle of the current instruction.
- Z8 Family of Microcontrollers 1
- UM001604-0108 2
- DO NOT USE IN LIFE SUPPORT 2
- LIFE SUPPORT POLICY 2
- As used herein 2
- Document Disclaimer 2
- Revision History 3
- Table of Contents 4
- Table of Contents 5
- Product Development Support 10
- UM001604-0108 Z8 11
- CPU Product Overview 11
- Address Space 12
- Address Space 13
- General-Purpose Registers 14
- RAM Protect 14
- Working Register Groups 14
- Error Conditions 17
- Standard Z8 Registers 22
- Expanded Z8 Registers 23
- Program Memory 26
- External Memory 27
- External Data Memory 28
- Clock Control 31
- External Clock Divide-By-Two 32
- Oscillator Control 33
- Oscillator Operation 34
- Circuit Board Design Rules 35
- Crystals and Resonators 36
- UM001604-0108 Clock 37
- Figure 19. LC Clock 37
- LC Oscillator 38
- RC Oscillator 39
- UM001604-0108 Reset 40
- Figure 22. Reset Timing 42
- User Manual 43
- Watchdog Timer 48
- Power-On Reset 49
- Input/Output Ports 50
- Input and Output Registers 51
- General I/O Mode 52
- Input/Output Ports 53
- Read/Write Operations 54
- Handshake Operation 54
- Handshake Operations 58
- General Port I/O 59
- Special Functions 68
- Port Handshake 70
- I/O Port Reset Conditions 73
- Analog Comparators 75
- Comparator Programming 78
- Comparator Operation 79
- Comparator Definitions 79
- Open-Drain Configuration 80
- Low EMI Emission 81
- Input Protection 82
- CMOS Autolatches 84
- Autolatch Model 85
- Design Considerations 85
- Counters and Timers 87
- Prescalers and Counter/Timers 88
- Counter/Timer Operation 90
- Prescaler Operations 91
- External Clock Input Mode 96
- Gated Internal Clock Mode 97
- Triggered Input Mode 97
- Cascading Counter/Timers 98
- Counters and Timers 100
- Interrupts 102
- Interrupt Sources 103
- External Interrupt Sources 104
- Internal Interrupt Sources 105
- Interrupt Initialization 106
- Interrupts 107
- Reset Conditions 116
- Power-Down Modes 117
- Power-Down Modes 118
- Stop Mode Recovery Register 119
- Serial Input/Output 122
- UART Bit-Rate Generation 123
- Serial Input/Output 124
- UART Receiver Operation 125
- Overwrites 126
- Framing Errors 126
- Transmitter Operation 127
- UART Reset Conditions 129
- Serial Peripheral Interface 129
- SPI Operation 132
- SPI Compare 132
- SPI Clock 132
- External Interface 138
- External Interface 139
- External Stacks 140
- Data Memory 141
- Bus Operation 141
- Address Strobe 143
- Data Strobe 143
- Extended Bus Timing 144
- Instruction Timing 145
- Reset Conditions 147
- Instruction Set 148
- Instruction Set 149
- Processor Flags 151
- Zero Flag 152
- Sign Flag 152
- Overflow Flag 152
- Decimal Adjust Flag 152
- Condition Codes 153
- Notation and Binary Encoding 154
- Assembly Language Syntax 156
- Instruction Summary 157
- Op Code Map 163
- Instruction Description 164
- Instruction Description 165
- Add With Carry 168
- Call Procedure 171
- Complement Carry Flag 173
- Complement 175
- Decimal Adjust 179
- Decrement 182
- Decrement Word 185
- Disable Interrupts 187
- Enable Interrupts 188
- Increment 190
- Increment Word 192
- Interrupt Return 194
- Jump Relative 197
- Load Constant 202
- Load Constant Autoincrement 204
- Load External Data 206
- No Operation 210
- Logical AND 211
- Logical OR 214
- Logical Exclusive OR 217
- Reset Carry Flag 224
- C D7D6D5D4D3D2D1D0 226
- CD7 D6 D5 D4 D3 D2 D1 D0 230
- Set Carry Flag 234
- Set Register Pointer 235
- Subtract 241
- Subtract With Carry 244
- Swap Nibbles 247
- Test Complement Under Mask 249
- Test Under Mask 252
- Watchdog Timer 255
- UM001604-0108 Index 257
- Customer Support 260
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