Mitsubishi DS5000TK Guide de l'utilisateur Page 81
- Page / 174
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
USER’S GUIDE
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81
Change Code
Perhaps most importantly, the user should reprogram
portions of the Secure Microcontroller that deal with se-
curity. For example, if the microprocessor is performing
DES, the user can change DES keys. Any security sys-
tem can be broken with enough time and resources. By
altering the security features, this threat can be mini-
mized.
External Circuits
A variety of external circuits can support secure opera-
tion. For example, the DS2400 is a unique 48–bit Silicon
Serial Number. If it is installed with the microprocessor, it
can be read when the system is first powered up, then
stored inside the Secure Microcontroller. This serializes
the system. If the software ever finds a different serial
number (or missing number) from the stored one, it can
refuse to work. This would mean that the microproces-
sor had been moved.
Tamper Protection
Using a variety of tamper sensors in conjunction with the
DS5002 makes the system very difficult to crack. These
circuits vary from simple switches to light, temperature,
pressure, or oxygen sensors. When the physical secu-
rity is violated, the SDI pin is activated and the memory
contents are destroyed.
- TABLE OF CONTENTS 1
- SECTION 1: INTRODUCTION 2
- SOFTWARE SECURITY 2
- SEPARATE ADDRESS/DATA BUS 2
- LARGE NONVOLATILE MEMORY 3
- IN–SYSTEM LOADING 3
- HIGH RELIABILITY OPERATION 3
- PRODUCT DESCRIPTION 4
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- SECTION 2: SELECTION GUIDE 6
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- INTERNAL DATA BUS 8
- INTERNAL ADDRESS BUS 8
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- Watchdog Timer 10
- Resident Loader ROM 10
- Secure Microcontroller Memory 11
- Organization 11
- Internal Registers 11
- Programmer’s note 12
- Program and Data Memory 13
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- DS5000 Memory Map Control 16
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- DS5001/DS5002 Memory Mapped 20
- Peripherals 20
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- Special Function Registers 28
- PA3 PA2 PA1 PA0 RA32/8 ECE2 29
- POWER CONTROL REGISTER 31
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- TIMER CONTROL REGISTER 33
- TIMER MODE REGISTER 34
- SERIAL CONTROL REGISTER 35
- INTERRUPT ENABLE REGISTER 36
- INTERRUPT PRIORITY REGISTER 37
- DS5001 CRC REGISTER 38
- DS5001 MCON REGISTER 40
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- PROGRAM STATUS WORD REGISTER 42
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- INSTRUCTION SET 46
- Introduction 46
- Addressing Modes 46
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- Program Status Flags 48
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- DATA RETENTION 56
- BATTERY BACKED CIRCUITS 56
- BATTERY ATTACH PROCEDURE 57
- BATTERY LIFETIME 57
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- LITHIUM BATTERY USAGE 59
- FRESHNESS SEAL 59
- SECTION 7: POWER MANAGEMENT 60
- Idle Mode 60
- Stop Mode 61
- Voltage Monitoring Circuitry 62
- Power Fail Interrupt 63
- Total Power Failure 63
- Partial Power Failures 63
- SECTION 8: SOFTWARE CONTROL 65
- Timed Access 65
- TIMED ACCESS Figure 8–1 65
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- WATCHDOG TIMER Figure 8–2 68
- WATCHDOG TIMER CONTROL BITS 69
- CRC MEMORY VERIFICATION 69
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- CRC CODE EXAMPLE Figure 8–3 71
- SECTION 9: FIRMWARE SECURITY 72
- SECURITY OVERVIEW 72
- SECURITY LOCK 73
- RAM Memory 73
- Encrypted Memory 73
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- Encryption Algorithm 76
- Encryption Key 76
- Dummy Bus Access 77
- On–chip Vector RAM 78
- Self–Destruct Input 78
- Microprobe/Die Top Coating 78
- Random Number Generator 78
- Security Summary by Part 79
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- Change Code 81
- External Circuits 81
- Tamper Protection 81
- SECTION 10: RESET CONDITIONS 82
- Reset Sources 82
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- Power On Reset 84
- Power On Reset 85
- External Reset 85
- Watchdog Timer Reset 85
- Memory Map 86
- Interrupts 87
- Protection 88
- SECTION 11: INTERRUPTS 89
- INTERRUPT SOURCES 89
- External Interrupts 90
- Timer Interrupts 90
- Serial Port Interrupts 90
- Power–fail Warning Interrupt 90
- Simulated Interrupts 91
- INTERRUPT PRIORITIES 93
- INTERRUPT ACKNOWLEDGE 94
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- SECTION 12: PARALLEL I/O 96
- OVERVIEW 96
- PORT 1 FUNCTIONAL CIRCUITRY 97
- PORT 2 FUNCTIONAL CIRCUITRY 97
- PORT 3 FUNCTIONAL CIRCUITRY 98
- OUTPUT FUNCTIONS 98
- INPUT FUNCTION 99
- REPROGRAMMABLE PERIPHERAL 100
- CONTROLLER (RPC) 100
- RPC INTERRUPTS 101
- Bit Description: 102
- RPC PROTOCOL 103
- DMA OPERATION 103
- FUNCTIONAL DESCRIPTION 105
- Bit Description 105
- USER’S GUIDE 106
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- SECTION 14: SERIAL I/O 110
- FUNCTION DESCRIPTION 110
- SCON.2: RB8 112
- SCON.1: TI 112
- SCON.0: RI 112
- BAUD RATE GENERATION 112
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- TRANSMIT TIMING: 115
- RECEIVE TIMING: 115
- ASYNCHRONOUS OPERATION 116
- Mode 2 and 3 117
- APPLICATION: SERIAL PORT 120
- INITIALIZATION 120
- SERIAL I/O OPERATING MODES 120
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- SECTION 15: CPU TIMING 124
- OSCILLATOR 124
- INSTRUCTION TIMING 125
- EXPANDED DATA MEMORY TIMING 129
- SECTION 16: PROGRAM LOADING 130
- INTRODUCTION 130
- INVOKING THE BOOTSTRAP LOADER 130
- DS5000 Series 131
- DS5001/DS5002 Series 131
- EXITING THE LOADER 131
- SERIAL PROGRAM LOAD MODE 133
- AUTO–BAUD RATE DETECTION 134
- COMMAND LINE INTERFACE 135
- COMMAND LINE SYNTAX 135
- COMMAND SUMMARIES 136
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- Xon/Xoff 138
- DS5002FP COMMANDS 138
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- INTEL HEX FILE FORMAT 140
- PARALLEL PROGRAM LOAD MODE 142
- PARALLEL PROGRAMMING CONCERNS 143
- RPC PROGRAM MODE OPERATION 143
- SECTION 17: REAL–TIME CLOCK 144
- DS1215 PHANTOM TIME CHIP 144
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- REGISTERS 148
- SPECIAL BITS 148
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- MEMORY MAP 151
- TIME–OF–DAY ALARM 152
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- DS1283 RTC INTERRUPTS 154
- (DS1215 EXAMPLE) 155
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- (DS1283 EXAMPLE) 159
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- SECTION 18: TROUBLESHOOTING 164
- UNEXPLAINED DEVICE RESETS 164
- WRONG TIME 164
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- OGRAM BRANCHING 174
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