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参数资料
| 型号： | AT91R40008-66AU-999 |
| 厂商： | Atmel |
| 文件页数： | 2/19页 |
| 文件大小： | 0K |
| 描述： | IC MCU 32BIT RISC 100LQFP |
| 产品培训模块： | MCU Product Line Introduction |
| 标准包装： | 1,000 |
| 系列： | AT91 |
| 核心处理器： | ARM7 |
| 芯体尺寸： | 16/32-位 |
| 速度： | 66MHz |
| 连通性： | EBI/EMI，UART/USART |
| 外围设备： | POR，WDT |
| 输入/输出数： | 32 |
| 程序存储器类型： | ROMless |
| RAM 容量： | 256K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 100-LQFP |
| 包装： | 带卷 (TR) |
| 配用： | AT91EB40A-ND - KIT EVAL FOR ARM AT91R40008 |
10
1732FS–ATARM–12-Apr-06
AT91R40008
The BMS pin is multiplexed with the I/O line P24, which can be programmed after reset like
any standard PIO line.
7.6.3
Remap Command
The ARM vectors (Reset, Abort, Data Abort, Pre-fetch 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 AT91R40008 microcontroller uses a Remap
command 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 manda-
tory 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 Pre-fetch 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 or not the address is defined.
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 1M byte banks up to four 16M bytes 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)
The user can program the EBI to control one 16-bit device (Byte Select Access mode) with a
16-bit wide data bus or two 8-bit devices in parallel that emulate a 16-bit memory (Byte Write
Access mode).
The External Bus Interface also features the Early Read Protocol, configurable for all the
devices, which 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT91R40807 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91R40807_02 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91R40807-33AC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| AT91R40807-33AI | 功能描述:ARM微控制器 - MCU LQFP IND TEMP RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT |
| AT91R40807-33AU | 功能描述:ARM微控制器 - MCU LQFP IND TEMP RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT |
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