Maxim-integrated High-Speed Microcontroller Bedienungsanleitung Seite 51
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High-Speed Microcontroller User’s Guide
Rev: 062210 51 of 176
EWT
Bit 1
Enable Watchdog Timer Reset. This bit enables/disables the ability of the watchdog
timer to reset the device. This bit has no effect on the ability of the watchdog timer to
generate a watchdog interrupt. The watchdog timer mode select bits (CKCON
.7-6)
control the timeout period of the watchdog timer. Clearing this bit will disable the
ability of the watchdog timer to generate a reset, but have no affect on the timer itself, or
its ability to generate a watchdog timer interrupt. This bit can only be modified using a
Timed Access Procedure. The default power-on reset state of this bit is 0 on the
ROMless devices. If the device contains internal program memory, the default power-on
reset state of EWT is determined by the Watchdog Default POR State bit (WDPOR)
located in the System Control Byte or a mask option. This bit is unaffected by all other
resets.
0 = A timeout of the watchdog timer will not cause the device to reset.
1 = A timeout of the watchdog timer will cause the device to reset.
RWT
Bit 0
Reset Watchdog Timer. Setting this bit will reset the watchdog timer count. This bit
must be set using a Timed Access procedure before the watchdog timer expires, or a
watchdog timer reset and/or interrupt will be generated if enabled. The timeout period is
defined by the Watchdog Timer Mode Select bits (CKCON
.7-6). This bit will always be
0 when read.
4.2.43 Accumulator (A or ACC)
7 6 5 4 3 2 1 0
SFR E0h ACC.7 ACC.6
ACC.5
ACC.4 ACC.3
ACC.2
ACC.1 ACC.0
RW-0 RW-0 RW-0 RW-0 RW-0
RW-0
RW-0 RW-0
R = Unrestricted Read, W = Unrestricted Write, -n = Value after Reset
ACC.7–ACC.0
Bits 7–0
Accumulator. This register serves as the accumulator for arithmetic operations. It is
functionally identical to the accumulator found in the 80C32.
- TABLE OF CONTENTS 2
- LIST OF FIGURES 7
- LIST OF TABLES 8
- 1. INTRODUCTION 9
- 2. ORDERING INFORMATION 10
- 3. ARCHITECTURE 11
- 3.1 ALU 11
- Rev: 062210 12 of 176 12
- 3.2.16 Interrupts 13
- 3.2.17 Timing Control 13
- 3.2.18 Real-Time Clock 13
- 3.2.19 Feature Summary 13
- 4. PROGRAMMING MODEL 14
- 4.1 Memory Organization 14
- Rev: 062210 15 of 176 15
- Figure 4-2. Register Map 16
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- Rev: 062210 22 of 176 22
- Rev: 062210 23 of 176 23
- Rev: 062210 24 of 176 24
- 4.2.1 Port 0 (P0) 25
- 4.2.2 Stack Pointer (SP) 25
- Rev: 062210 26 of 176 26
- 4.2.8 Power Control (PCON) 27
- INT1 pin 28
- INT0 is level triggered 28
- Rev: 062210 29 of 176 29
- 4.2.11 Timer 0 LSB (TL0) 30
- 4.2.12 Timer 1 LSB (TL1) 30
- 4.2.13 Timer 0 MSB (TH0) 30
- 4.2.14 Timer 1 MSB (TH1) 30
- Rev: 062210 31 of 176 31
- 4.2.16 Port 1 (P1) 32
- RG bit 33
- Rev: 062210 34 of 176 34
- 4.2.21 Port 2 (P2) 36
- 7 6 5 4 3 2 1 0 37
- 4.2.25 Port 3 (P3) 38
- Rev: 062210 41 of 176 41
- RMS2, RMS1 42
- DME1, DME0 44
- LB3, LB2, LB1 44
- Rev: 062210 45 of 176 45
- CP/RL2 EXEN2 DCEN RESULT 46
- 4.2.36 Timer 2 Mode (T2MOD) 47
- 4.2.39 Timer 2 LSB (TL2) 48
- 4.2.40 Timer 2 MSB (TH2) 48
- Rev: 062210 49 of 176 49
- Rev: 062210 51 of 176 51
- 4.2.45 B Register (B) 52
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- Rev: 062210 54 of 176 54
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- Rev: 062210 56 of 176 56
- Rev: 062210 57 of 176 57
- 4.3 Instruction Timing 58
- 4.4 Addressing Modes 59
- 4.4.2 Direct Addressing 60
- 4.4.4 Immediate Addressing 61
- 4.4.6 Relative Addressing 61
- 4.4.7 Page Addressing 61
- 4.5 Program Status Flags 62
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- 5.6 Instruction Timing 64
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- Memory Access 66
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- 22h 68
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- Rev: 062210 70 of 176 70
- 5.7 Comparison to the 8051 71
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- Rev: 062210 73 of 176 73
- Rev: 062210 74 of 176 74
- Rev: 062210 75 of 176 75
- 6. MEMORY ACCESS 76
- 6.1 Internal Program Memory 76
- 6.2 Internal Data Memory 76
- 6.2.1 ROMSIZE Feature 77
- RMS2 RMS1 RMS0 78
- MAX ON-CHIP ROM 78
- Rev: 062210 79 of 176 79
- Rev: 062210 80 of 176 80
- 6.5 Data Memory Access 81
- Rev: 062210 82 of 176 82
- Rev: 062210 83 of 176 83
- 6.6 Data Memory Timing 84
- CKCON.2–0 85
- Rev: 062210 86 of 176 86
- C1 C2 C3 C4 87
- 7. POWER MANAGEMENT 88
- Precision Voltage Monitor 88
- 7.1.2 Power-Fail Reset 89
- 7.1.3 Power-On Reset 89
- 7.1.4 Bandgap Select 89
- Rev: 062210 90 of 176 90
- 7.1.5 Watchdog Wake-Up 91
- Rev: 062210 92 of 176 92
- 7.2 Power Conservation 93
- Rev: 062210 94 of 176 94
- 7.3 Power Management Modes 95
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- Rev: 062210 97 of 176 97
- 7.3.3 Switchback 98
- Rev: 062210 99 of 176 99
- Rev: 062210 100 of 176 100
- RG bit. The procedure to 101
- 8. RESET CONDITIONS 102
- 8.1 Reset Sources 102
- 8.2 Reset State 103
- 8.3 No-Battery Reset 103
- 8.4 In-System Disable Mode 104
- 9.1 Interrupt Overview 105
- 9. INTERRUPTS 105
- 9.2 Interrupt Sources 106
- 9.2.2 Timer Interrupts 107
- 9.2.4 Real-Time Clock 107
- 9.2.5 Power-Fail Interrupt 107
- 9.3 Simulated Interrupts 108
- 9.4 Interrupt Priorities 108
- 9.6 Interrupt Latency 109
- Rev: 062210 110 of 176 110
- Rev: 062210 111 of 176 111
- 10. PARALLEL I/O 112
- 10.1 Port 0 112
- 10.2 Port 2 113
- 10.3 Ports 1 and 3 114
- 10.4 Output Functions 115
- 10.6 Input Functions 115
- 10.9 I/O Port Timing 116
- 10.10 Optional Functions 117
- 11. PROGRAMMABLE TIMERS 118
- 11.1 16-Bit Timers 118
- INT1 and TR1 = 119
- 11.2 Mode 0 120
- 11.3 Mode 1 121
- 11.4 Mode 2 122
- 11.5 Mode 3 123
- 11.6 Timer 2 124
- Rev: 062210 125 of 176 125
- 11.7 Timer 2 Modes 126
- T2 = 1. As 127
- TIMER 2 128
- INTERRUPT 128
- T2CON.7 128
- 11.7.5 Baud-Rate Generator 129
- RL2 = 0 130
- 11.8 Time Base Selection 131
- 11.9 Watchdog Timer 132
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- Rev: 062210 134 of 176 134
- Rev: 062210 135 of 176 135
- 12. SERIAL I/O 136
- 12.1 Serial Mode Summary 136
- 12.1.3 Mode 2 137
- 12.1.4 Mode 3 137
- Rev: 062210 138 of 176 138
- Rev: 062210 139 of 176 139
- 12.3 Baud Rates 140
- 12.3.2 Mode 2 141
- 12.3.3 Mode 1 or 3 141
- 12.4 Serial I/O Description 143
- 12.4.2 Mode 1 145
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- RECEIVE TIMING 146
- TRANSMIT TIMING 146
- 12.4.3 Mode 2 147
- REGISTER 148
- 12.4.4 Mode 3 149
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- SADDR 11110000 151
- Rev: 062210 152 of 176 152
- 13. TIMED-ACCESS PROTECTION 153
- 13.1 Protected Bits 153
- 13.2 Protection Scheme 153
- TABLE_READ: 155
- 14. REAL-TIME CLOCK 156
- 14.3 Using the RTC Alarm 158
- TRMx bits must be 160
- 15. BATTERY BACKUP 161
- 15.1 Selecting a Battery 161
- REGISTER NAME LOCATION 162
- 16. INSTRUCTION SET DETAILS 163
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- Rev: 062210 165 of 176 165
- MNEMONIC 165
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- 171 of 176 171
- 17. TROUBLESHOOTING 172
- 18.1 Technical Support 174
- 18.2 Development Tools 174
- 18.3 Software Compatibility 174
- Rev: 062210 175 of 176 175
- 2010 Maxim Integrated 176
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