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參數(shù)資料
| 型號： | AT91M40807-33AI |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontroller |
| 中文描述： | 32-BIT, MROM, 33 MHz, RISC MICROCONTROLLER, PQFP100 |
| 封裝： | 1.40 MM HEIGHT, TQFP-100 |
| 文件頁數(shù)： | 10/153頁 |
| 文件大?。?/td> | 1837K |
| 代理商： | AT91M40807-33AI |
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10
AT91X40 Series
1354D
–
ATARM
–
05/02
ROM Emulation
The AT91R40807 provides an ideal means of emulating the ROM version
AT91M40807. The secondary SRAM bank of the AT91R40807 is mapped to the same
address as the ROM of the AT91M40807. It is write-protected after a reset; writing 0x1
in the Memory Mode Register of the Special Function Module can disable this
protection.
At system power-up, the code is downloaded from an external non-volatile memory or
through a debugger to the on-chip secondary SRAM bank of the AT91R40807. After the
secondary SRAM bank write-protection is enabled, the application is in the same envi-
ronment as though it were running on an AT91M40807.
Boot Mode Select
The ARM reset vector is at address 0x0. After the NRST line is released, the
ARM7TDMI executes the instruction stored at this address. This means that this
address must be mapped in non-volatile memory after the reset.
The input level on the BMS pin during the last 10 clock cycles before the rising edge of
the NRST selects the type of boot memory. The Boot Mode depends on BMS and
whether or not the AT91X40 Series Microcontroller has on-chip ROM or extended
SRAM (see Table 3).
The AT91R40807 supports boot in on-chip extended SRAM, for the purpose of emulat-
ing ROM versions. In this case, the microcontroller must first boot from external non-
volatile memory, and ensure that a valid program is downloaded in the on-chip extended
SRAM. Then, the NRST must be reasserted by external circuitry after the level on the
pin BMS is changed.
The pin BMS is multiplexed with the I/O line P24 that can be programmed after reset like
any standard PIO line.
Remap Command
The ARM vectors (Reset, Abort, Data Abort, Prefetch Abort, Undefined Instruction,
Interrupt, Fast Interrupt) are mapped from address 0x0 to address 0x20. In order to
allow these vectors to be redefined dynamically by the software, the AT91X40 Series
Microcontrollers use a remap command that enables switching between the boot mem-
ory and the internal primary SRAM bank addresses. The remap command is accessible
through the EBI User Interface, by writing one in RCB of EBI_RCR (Remap Control
Register). Performing a remap command is mandatory if access to the other external
devices (connected to chip selects 1 to 7) is required. The remap operation can only be
changed back by an internal reset or an NRST assertion.
Abort Control
The abort signal providing a Data Abort or a Prefetch Abort exception to the ARM7TDMI
is asserted in the following cases:
When accessing an undefined address in the EBI address space
When writing to a write-protected internal memory area on the AT91R40807
Table 3.
Boot Mode Select
BMS
Product
Boot Memory
1
AT91M40800
External 8-bit memory on NCS0
AT91R40807
Internal 32-bit extended SRAM
AT91M40807
Internal 32-bit ROM
AT91R40008
External 8-bit memory on NCS0
0
All
External 16-bit memory on NCS0
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相關(guān)代理商/技術(shù)參數(shù) |
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| AT91M42800 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91M42800-33AI | 功能描述:IC ARM7 MCU 144 TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AT91 標(biāo)準(zhǔn)包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，WDT 輸入/輸出數(shù):32 程序存儲器容量:32KB（32K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
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| AT91M42800A | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91M42800A_0203 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
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