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參數(shù)資料
| 型號： | AT91F40816-33CI |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | ARM Thumb Microcontrollers |
| 中文描述： | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA120 |
| 封裝： | BGA-120 |
| 文件頁數(shù)： | 10/22頁 |
| 文件大小： | 248K |
| 代理商： | AT91F40816-33CI |
10
AT91F40816
1348D–ATARM–03/04
Standard RS232 drivers generally contain internal 400K Ohm pull-up resistors. If TXD1
is connected 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.
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 con-
nected to a host computer via the external ICE interface.
In ICE Debug mode, the ARM7TDMI core responds with a non-JTAG chip ID that identi-
fies the microcontroller. This is not fully IEEE1149.1 compliant.
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.
Internal Memories
The AT91F40816 integrates 8K bytes of primary internal SRAM that is 32 bits wide and
single-clock cycle accessible. This SRAM is mapped at address 0x0 (after the remap
command), allowing ARM7TDMI exception vectors between 0x0 and 0x20 to be modi-
fied by the software. The rest of the SRAM can be used for stack allocation (to speed up
context saving and restoring), or as data and program storage for critical algorithms.
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 AT91F40816 also integrates a 2-Mbyte Flash memory that is accessed via the
External Bus Interface. All data, address and control lines, except for the Chip Select
signal, are connected within the device. Byte and half-word accesses are supported.
Boot Mode Select
The ARM reset vector is at address 0x0. After the NRST line is released, the
ARM7TDMI executes 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 3). If the embedded Flash mem-
ory is to be used as boot memory, the BMS input must be pulled down externally.
The pin BMS is multiplexed with the I/O line P24 that can be programmed after reset like
any standard PIO line.
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 AT91F40816 uses
a remap command that enables switching between the boot memory and the internal
primary SRAM addresses. The remap command is accessible through the EBI User
Table 3.
Boot Mode Select
BMS
Boot Memory
1
External 8-bit memory on NCS0
0
External 16-bit memory on NCS0
相關PDF資料 |
PDF描述 |
|---|---|
| AT91FR40161 | ARM Thumb Microcontrollers |
| AT91FR40161-CI | ARM Thumb Microcontrollers |
| AT91FR40162-CI | AT91 ARM Thumb Microcontrollers |
| AT91FR40162 | AT91 ARM Thumb Microcontrollers |
| AT91FR4042 | AT91 ARM Thumb Microcontrollers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT91FR40161 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:ARM Thumb Microcontrollers |
| AT91FR40161-CI | 功能描述:IC MCU ARM7 2M FLASH 120-BGA RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AT91 標準包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設備:POR，WDT 輸入/輸出數(shù):32 程序存儲器容量:32KB（32K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據轉換器:- 振蕩器型:內部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
| AT91FR40162 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91FR40162_02 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
| AT91FR40162-CI | 功能描述:IC ARM7 MCU 2M FLASH 121 PBGA RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AT91 標準包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設備:POR，WDT 輸入/輸出數(shù):32 程序存儲器容量:32KB（32K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據轉換器:- 振蕩器型:內部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
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