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參數(shù)資料
| 型號： | AT91R40008-66AU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 19/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ARM7 MCU 100 LQFP |
| 產(chǎn)品培訓模塊： | SAM9 MPU Boot Solutions & Application Deployment MCU Product Line Introduction |
| 標準包裝： | 90 |
| 系列： | AT91 |
| 核心處理器： | ARM7 |
| 芯體尺寸： | 16/32-位 |
| 速度： | 66MHz |
| 連通性： | EBI/EMI，UART/USART |
| 外圍設備： | POR，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器類型： | ROMless |
| RAM 容量： | 256K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 100-LQFP |
| 包裝： | 托盤 |
| 配用： | AT91EB40A-ND - KIT EVAL FOR ARM AT91R40008 |
9
1732FS–ATARM–12-Apr-06
AT91R40008
To enter tri-state mode, the NTRI pin must be held low during the last 10 clock cycles before
the rising edge of NRST. For normal operation, the NTRI pin must be held high during reset by
a resistor of up to 400 k
.
NTRI is multiplexed with I/O line P21 and USART1 serial data transmit line TXD1.
Standard RS-232 drivers generally contain internal 400 k
pull-up resistors. If TXD1 is con-
nected to a device not including this pull-up, the user must make sure that a high level is tied
on NTRI while NRST is asserted.
7.5.2
JTAG/ICE Debug
ARM standard embedded in-circuit emulation is supported via the JTAG/ICE port. The pins
TDI, TDO, TCK and TMS are dedicated to this debug function and can be connected to a host
computer via the external ICE interface.
In ICE Debug mode, the ARM7TDMI core responds with a non-JTAG chip ID that identifies the
microcontroller. This is not fully IEEE1149.1 compliant.
7.6
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.
7.6.1
Internal Memories
The AT91R40008 microcontroller integrates 256K bytes of internal SRAM. All internal memo-
ries 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 is mapped at address 0x0 (after the Remap command), allowing ARM7TDMI
exception vectors between 0x0 and 0x20 to be modified by the software.
Placing the SRAM on-chip and using the 32-bit data bus bandwidth maximizes the microcon-
troller performance and minimizes the system power consumption. The 32-bit bus increases
the effectiveness of the use of the ARM instruction set and the ability of processing data that is
wider than 16-bit, thus making optimal use of the ARM7TDMI advanced performance.
Being able to dynamically update application software in the 256-Kbyte SRAM adds an extra
dimension to the AT91R40008.
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 7-1).
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT91R40008-66AU SL383 | 制造商:Atmel Corporation 功能描述:MCU 32-Bit 91R ARM7TDMI RISC ROMLess 1.8V 100-Pin LQFP T/R |
| AT91R40008-66AU | 制造商:Atmel Corporation 功能描述:IC 32-BIT MCU ARM7 66MHZ 100-LQFP |
| AT91R40008-66AU-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 最大時鐘頻率:72 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| AT91R40807 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91R40807_02 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
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