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参数资料
| 型号： | AT91M55800A-33CJ-999 |
| 厂商： | Atmel |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC MCU 32BIT RISC 176LFBGA |
| 标准包装： | 1 |
| 系列： | AT91 |
| 核心处理器： | ARM7 |
| 芯体尺寸： | 16/32-位 |
| 速度： | 33MHz |
| 连通性： | EBI/EMI，SPI，UART/USART |
| 外围设备： | POR，WDT |
| 输入/输出数： | 58 |
| 程序存储器类型： | ROMless |
| RAM 容量： | 8K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 3.6 V |
| 数据转换器： | A/D 8x10b; D/A 2x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 176-LFBGA |
| 包装： | 剪切带 (CT) |
| 其它名称： | AT91M55800A-33CJ-999CT |
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1745FS–ATARM–18-Apr-06
AT91M55800A Summary
Internal peripherals in the four highest megabytes
In any of these address spaces, the ARM7TDMI operates in Little-Endian mode only.
7.6.1
Internal Memories
The AT91M55800A microcontroller integrates an 8-Kbyte primary SRAM bank. This memory
bank is mapped at address 0x0 (after the remap command), allowing ARM7TDMI exception
vectors between 0x0 and 0x20 to be modified by the software. The rest of the bank can be
used for stack allocation (to speed up context saving and restoring), or as data and program
storage for critical algorithms. All internal memory is 32 bits wide and single-clock cycle acces-
sible. Byte (8-bit), half-word (16-bit) or word (32-bit) accesses are supported and are executed
within one cycle. Fetching Thumb or ARM instructions is supported and internal memory can
store twice as many Thumb instructions as ARM ones.
7.6.2
Boot Mode Select
The ARM reset vector is at address 0x0. After the NRST line is released, the ARM7TDMI exe-
cutes the instruction stored at this address. This means that this address must be mapped in
nonvolatile 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 (see Table 5).
The BMS pin is multiplexed with the I/O line PB18 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 AT91M55800A microcontroller uses a remap
command that enables switching between the boot memory and the internal RAM 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
Table 7-2.
Boot Mode Select
BMS
Boot Mode
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 |
|---|---|
| AT91M55800A-33CJ-T | 功能描述:IC MCU 32BIT ROMLESS 176LFBGA 制造商:microchip technology 系列:AT91 包装:带卷（TR） 零件状态:停產 核心处理器:ARM7? 核心尺寸:16/32-位 速度:33MHz 连接性:EBI/EMI，SPI，UART/USART 外设:POR，WDT I/O 数:58 程序存储容量:- 程序存储器类型:ROMless EEPROM 容量:- RAM 容量:8K x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 3.6 V 数据转换器:A/D 8x10b；D/A 2x10b 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:176-LFBGA 供应商器件封装:176-LFBGA（11.2x11.2） 基本零件编号:AT91M55800 标准包装:1,000 |
| AT91M63200 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91M63200_99 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91M63200-12AI-1.8 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:ARM Thumb Microcontrollers |
| AT91M63200-25AC | 功能描述:IC MCU 32BIT ROMLESS 176TQFP 制造商:microchip technology 系列:AT91SAM 包装:托盘 零件状态:停產 核心处理器:ARM7? 核心尺寸:16/32-位 速度:25MHz 连接性:EBI/EMI，SPI，UART/USART 外设:POR，WDT I/O 数:58 程序存储容量:- 程序存储器类型:ROMless EEPROM 容量:- RAM 容量:2K x 8 电压 - 电源（Vcc/Vdd）:1.8 V ~ 3.6 V 数据转换器:- 振荡器类型:外部 工作温度:0°C ~ 70°C 封装/外壳:176-LQFP 供应商器件封装:176-TQFP（24x24） 基本零件编号:AT91M63200 标准包装:40 |
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