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1348FS–ATARM–13-Apr-06
AT91M40800
The pin BMS is multiplexed with the I/O line P24 that can be programmed after reset like any
standard PIO line.
7.6.3
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 AT91M40800 microcontroller uses a remap com-
mand that enables switching between the boot memory 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.
7.6.4
Abort Control
The abort signal providing a Data Abort or a Prefetch Abort exception to the ARM7TDMI is
asserted when accessing an undefined address in the EBI address space.
No abort is generated when reading the internal memory or by accessing the internal peripher-
als, whether the address is defined or not.
7.6.5
External Bus Interface
The External Bus Interface handles the accesses between addresses 0x0040 0000 and 0xFFC0
0000. It generates the signals that control access to the external devices, and can be configured
from eight 1-Mbyte banks up to four 16-Mbyte banks. It supports byte-, half-word- and word-
aligned accesses.
For each of these banks, the user can program:
Number of wait states
Number of data float times (wait time after the access is finished to prevent any bus
contention in case the device is too long in releasing the bus)
Data bus-width (8-bit or 16-bit).
With a 16-bit wide data bus, the user can program the EBI to control one 16-bit device (Byte
Access Select mode) or two 8-bit devices in parallel that emulate a 16-bit memory (Byte
Write Access mode).
The External Bus Interface features also the Early Read Protocol, configurable for all the
devices, that significantly reduces access time requirements on an external device in the case of
single-clock cycle access.
Table 7-1.
Boot Mode Select
BMS
Boot Memory
1
External 8-bit memory on NCS0
0
External 16-bit memory on NCS0
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| AT91M40800-33AI SL383 | 功能描述:IC ARM MCU 16BIT 100TQFP 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:1,500 系列:AVR® ATtiny 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C，LIN，SPI，UART/USART，USI 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):16 程序存儲(chǔ)器容量:8KB（4K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 11x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:帶卷 (TR) |
| AT91M40800-33AI-T | 功能描述:IC MCU 32BIT ROMLESS 100LQFP 制造商:microchip technology 系列:AT91 包裝:帶卷（TR） 零件狀態(tài):停產(chǎn) 核心處理器:ARM7? 核心尺寸:16/32-位 速度:33MHz 連接性:EBI/EMI，UART/USART 外設(shè):POR，WDT I/O 數(shù):32 程序存儲(chǔ)容量:- 程序存儲(chǔ)器類型:ROMless EEPROM 容量:- RAM 容量:8K x 8 電壓 - 電源（Vcc/Vdd）:1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器類型:外部 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:100-LQFP 供應(yīng)商器件封裝:100-LQFP（14x14） 基本零件編號(hào):AT91M40800 標(biāo)準(zhǔn)包裝:1,000 |
| AT91M40800-33AU | 功能描述:ARM微控制器 - MCU 8K SRAM Ext Bus Interface IND TEMP RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:72 MHz 程序存儲(chǔ)器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| AT91M40800-33AU-999 | 功能描述:ARM微控制器 - MCU Ind. Temp Green RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:72 MHz 程序存儲(chǔ)器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| AT91M40807 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
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