- 您现在的位置：买卖IC网 > PDF目录11790 > AT91M42800A-33CJ-999 (Atmel)IC MCU 32BIT RISC 144BGA PDF资料下载
参数资料
| 型号： | AT91M42800A-33CJ-999 |
| 厂商： | Atmel |
| 文件页数： | 6/27页 |
| 文件大小： | 0K |
| 描述： | IC MCU 32BIT RISC 144BGA |
| 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： | 54 |
| 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 |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 144-LFBGA |
| 包装： | 剪切带 (CT) |
| 其它名称： | AT91M42800A-33CJ-999CT |
第1页第2页第3页第4页第5页当前第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
14
1779ES–ATARM–14-Apr-06
AT91M42800A
7.6.3
IEEE 1149.1 JTAG Boundary Scan
IEEE 1149.1 JTAG Boundary Scan is enabled when MODE0 is low and MODE1 is high. The
functions SAMPLE, EXTEST and BYPASS are implemented. In ICE Debug mode, the ARM
core responds with a non-JTAG chip ID that identifies the core to the ICE system. This is not
IEEE 1149.1 JTAG compliant. It is not possible to switch directly between JTAG and ICE opera-
tions. A chip reset must be performed (NRST and NTRST) after MODE0 and MODE1 are
changed.
7.7
Memory Controller
The ARM7TDMI processor address space is 4G bytes. The memory controller decodes the
internal 32-bit address bus and defines three address spaces:
Internal Memories in the four lowest megabytes
Middle Space reserved for the external devices (memory or peripherals) controlled by the
EBI
Internal Peripherals in the four highest megabytes
In any of these address spaces, the ARM7TDMI operates in little-endian mode only.
7.7.1
Protection Mode
The embedded peripherals can be protected against unwanted access. The PME (Protect Mode
Enable) pin must be tied high and validated in its peripheral operation (PIO Disable) to enable
the protection mode. When enabled, any peripheral access must be done while the ARM7TDMI
is running in Privileged mode (i.e., the accesses in user mode result in an abort). Only the valid
peripheral address space is protected and requests to the undefined addresses will lead to a
normal operation without abort.
7.7.2
Internal Memories
The AT91M42800A microcontroller integrates an 8-Kbyte primary internal SRAM. All internal
memories are 32 bits wide and single-clock cycle accessible. 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.
The SRAM bank is mapped at address 0x0 (after the remap command), and ARM7TDMI excep-
tion vectors between 0x0 and 0x20 that can 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 pro-
gram storage for critical algorithms.
7.7.3
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 SLCK clock cycles before the rising edge of the
NRST selects the type of boot memory. The Boot mode depends on BMS (see Table 7-1).
相关PDF资料 |
PDF描述 |
|---|---|
| VI-BTJ-IW-F2 | CONVERTER MOD DC/DC 36V 100W |
| VI-BTH-IX-F3 | CONVERTER MOD DC/DC 52V 75W |
| MAX1840EUB+ | IC TRANS LEVEL SIM 10-UMAX |
| VI-BTH-IX-F2 | CONVERTER MOD DC/DC 52V 75W |
| DS8023-RJX+ | IC INTERFACE SMART CARD 28-TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT91M43300 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:ARM Thumb Microcontrollers |
| AT91M43300-12CC-1.8 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:ARM Thumb Microcontrollers |
| AT91M43300-12CI-1.8 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:ARM Thumb Microcontrollers |
| AT91M43300-25CC | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:ARM Thumb Microcontrollers |
| AT91M43300-25CI | 功能描述:IC ARM7 MCU 144 BGA RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:AT91 标准包装:9 系列:87C 核心处理器:8051 芯体尺寸:8-位 速度:40/20MHz 连通性:UART/USART 外围设备:POR，WDT 输入/输出数:32 程序存储器容量:32KB（32K x 8） 程序存储器类型:OTP EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:0°C ~ 70°C 封装/外壳:40-DIP（0.600"，15.24mm） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。