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Chapter 53 Fixed Mode-Reset Vector / BOOT-ROM
1.Overview
Chapter 53 Fixed Mode-Reset Vector / BOOT-ROM
1. Overview
The Boot ROM is a fixed start-up routine, which is located at memory addresses 0xB000 to 0xBFFF. The entry
point 0xBFF8 is determined by the Fixed Reset Vector if the device is configured with the mode pins set to
MD[2:0]=”000” (internal ROM/vector mode). In this mode MB91460 series devices use the Fixed Mode Vector data
(FMV, address 0x0F:FFF8, data 0x06000000) and Fixed Reset Vector data (FRV, address 0x0F:FFFC, data
0x0000BFF8). The data of both these vectors are independent from the flash content at these two addresses.
The purpose of the Boot ROM is to configure the device after a reset and to provide a simple serial bootloader for
programming the embedded flash memories.
Therefore it is executed always after the Reset Cancellation Sequence (see chapter
5.6
Reset Cancellation
Sequence (Page No.147)
or
7.6 Reset Cancellation Sequence (Page No.149)
) of every INIT or RST reset.
2. Check for Boot Conditions
The check for boot conditions is slightly different for the evaluation chip MB91V460 (A-version) and the flash
derivates (e.g. MB91F467DA).
2.1 Evaluation Chip MB91V460
After the chip initialization and saving the RSRR (Reset Cause Register) to CPU register R4, the Boot Security
Vector (BSV: Vector #144, 0x0F:FDBC) will be checked. This check is performed as follows: if the data of this
vector represents a valid address in the specified address range, the Boot Security Vector itself becomes valid.
If the Boot Security Vector is valid, the Boot ROM is left and the user application is started at the address given by
this vector.
The purpose of this feature is to disable the execution of the internal bootloader due to security reasons or to
minimize startup time of the application. Only if the user sets the Boot Security Vector to an address outside the
given address range or leaves this vector at default content after erase (0xFFFF:FFFF) the internal bootloader can
be entered.
If the Boot Security Vector is not valid, the reset cause will be checked as second boot condition. Only if the reset
cause was an INIT reset (external INITX pin input, RSRR=0x80), the check for boot conditions will go on.
Otherwise Boot ROM is left and application is started at default user program entry address 0x0F:4000.
If the reset cause was an INIT reset, UART0 is initialized: 2400 baud, 8 data bits, 1 stop bit, no parity. UART-
reception is checked for about 100 ms. If during this time period the ASCII-character “V” (0x56) is received, the
internal bootloader is entered. Otherwise Boot ROM is left and application is started at default user program entry
address 0x0F:4000.
Device
Valid Boot Security Vector address range
MB91V460
0x04:0000 – 0x13:FFFF
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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