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型號(hào)：	MT80C31-25R
廠(chǎng)商：	TEMIC SEMICONDUCTORS
元件分類(lèi)：	微控制器/微處理器
英文描述：	8-BIT, 25 MHz, MICROCONTROLLER, PQFP44
文件頁(yè)數(shù)：	971/1447頁(yè)
文件大?。?/td>	3788K
代理商：	MT80C31-25R

6437E–ATARM–23-Apr-13

11. Boot Strategies

The system always boots at address 0x0. To ensure maximum boot possibilities the memory

layout can be changed with two parameters.

REMAP allows the user to layout the internal SRAM bank to 0x0 to ease the development.

This is done by software once the system has boot.

BMS allows the user to layout to 0x0, when convenient, the ROM or an external memory. This

is done by hardware at reset.

Note: All the memory blocks can always be seen at their specified base addresses that are not

concerned by these parameters.

The SAM9M11 manages a boot memory that depends on the level on the BMS pin at reset. The

internal memory area mapped between address 0x0 and 0x000F FFFF is reserved to this effect.

If BMS is detected at 0, the boot memory is the memory connected on the Chip Select 0 of the

External Bus Interface.

Boot on on-chip RC

Boot with the default configuration for the Static Memory Controller, byte select mode, 16-bit

data bus, Read/Write controlled by Chip Select, allows boot on 16-bit non-volatile memory.

For optimization purpose, nothing else is done. To speed up the boot sequence user pro-

grammed software should perform a complete configuration:

Enable the 32768 Hz oscillator if best accuracy is needed

Program the PMC (main oscillator enable or bypass mode)

Program and Start the PLL

Reprogram the SMC setup, cycle, hold, mode timings registers for EBI CS0 to adapt them to

the new clock

Switch the system clock to the new value

If BMS is detected at 1, the boot memory is the embedded ROM and the boot program

described below is executed.

Boot Program

The Boot Program is contained in the embedded ROM. It is also called: “Rom Code” or “First

level bootloader”. At power on, if the BMS pin is detected at 1, the boot memory is the embed-

ded ROM and the Boot Program is executed.

The Boot Program consists of several steps. First, it performs device initialization. Then it

attempts to boot from external non volatile memories (NVM). And finally, if no valid program is

found in NVM, it executes a monitor called SAM-BA Monitor.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MT80C31BH	制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intel 功能描述:
MT80C51BH	制造商:ROCHESTER 制造商全稱(chēng):ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space
MT80C51FB	制造商:Rochester Electronics LLC 功能描述:- Bulk
MT80C51FB/B	制造商:Intel 功能描述:
MT80GB	制造商:Datak Corporation 功能描述:

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