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參數(shù)資料
| 型號： | AT91M42800A-33AI |
| 廠商： | Atmel |
| 文件頁數(shù)： | 5/27頁 |
| 文件大小： | 0K |
| 描述： | IC ARM7 MCU 144 TQFP |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 系列： | AT91 |
| 核心處理器： | ARM7 |
| 芯體尺寸： | 16/32-位 |
| 速度： | 33MHz |
| 連通性： | EBI/EMI，SPI，UART/USART |
| 外圍設(shè)備： | WDT |
| 輸入/輸出數(shù)： | 54 |
| 程序存儲器類型： | ROMless |
| RAM 容量： | 8K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 3.6 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 144-LQFP |
| 包裝： | 托盤 |
| 配用： | AT91EB42-ND - KIT EVAL FOR ARM AT91M42800A |
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13
1779ES–ATARM–14-Apr-06
AT91M42800A
Figure 7-1.
Seperate or Common Reset Management
Notes:
1. NRST and NTRST handling in Debug Mode during development.
2. NRST and NTRST handling during production.
In order to benefit from the separation of NRST and NTRST during the debug phase of develop-
ment, the user must independently manage both signals as shown in example (1) of Figure 7-1
above. However, once debug is completed, both signals are easily managed together during
production as shown in example (2) of Figure 7-1 above.
7.5.3
Watchdog Reset
The internally generated watchdog reset has the same effect as the NRST pin, except that the
pins BMS and NTRI are not sampled. Boot mode and Tri-state mode are not updated. The
NRST pin has priority if both types of reset coincide.
7.6
Emulation Functions
7.6.1
Tri-state Mode
The AT91M42800A provides a Tri-state mode, which is used for debug purposes in order to
connect an emulator probe to an application board. In Tri-state mode the AT91M42800A contin-
ues to function, but all the output pin drivers are tri-stated.
To enter Tri-state mode, the pin NTRI must be held low during the last 10 SLCK clock cycles
before the rising edge of NRST. For normal operation, the pin NTRI must be held high during
reset, by a resistor of up to 400 k
. NTRI must be driven to a valid logic value during reset.
NTRI is multiplexed with Parallel I/O PA9 and USART 1 serial data transmit line TXD1.
Standard RS232 drivers generally contain internal 400 k
pull-up resistors. If TXD1 is connected
to one of these drivers, this pull-up will ensure normal operation, without the need for an addi-
tional external resistor.
7.6.2
Embedded ICE
ARM standard embedded in-circuit emulation is supported via the JTAG/ICE port. It is con-
nected to a host computer via an embedded ICE Interface.
Embedded ICE mode is selected when MODE1 is low.
It is not possible to switch directly between ICE and JTAG operations. A chip reset must be per-
formed (NRST and NTRST) after MODE0 and/or MODE1 have/has been changed. The reset
input to the Embedded ICE (NTRST) is provided separately to facilitate debug of boot programs.
(1)
(2)
Reset
Controller
Reset
Controller
Reset
Controller
NTRST
NRST
NTRST
NRST
AT91M42800A
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| AT91M42800A-33AI SL383 | 功能描述:IC ARM MCU 16BIT 144TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AT91 標(biāo)準(zhǔn)包裝:1,500 系列:AVR® ATtiny 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C，LIN，SPI，UART/USART，USI 外圍設(shè)備:欠壓檢測/復(fù)位，POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):16 程序存儲器容量:8KB（4K x 16） 程序存儲器類型:閃存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 11x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:帶卷 (TR) |
| AT91M42800A-33AI-T | 功能描述:IC MCU 32BIT ROMLESS 144LQFP 制造商:microchip technology 系列:AT91 包裝:帶卷（TR） 零件狀態(tài):停產(chǎn) 核心處理器:ARM7? 核心尺寸:16/32-位 速度:33MHz 連接性:EBI/EMI，SPI，UART/USART 外設(shè):WDT I/O 數(shù):54 程序存儲容量:- 程序存儲器類型:ROMless EEPROM 容量:- RAM 容量:8K x 8 電壓 - 電源（Vcc/Vdd）:2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器類型:外部 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:144-LQFP 供應(yīng)商器件封裝:144-LQFP（20x20） 基本零件編號:AT91M42800 標(biāo)準(zhǔn)包裝:1,000 |
| AT91M42800A-33AU | 功能描述:ARM微控制器 - MCU 8kB SRAM 33MHz - PWM 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(fēng)格:SMD/SMT |
| AT91M42800A-33AU-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(fēng)格:SMD/SMT |
| AT91M42800A-33CI | 功能描述:IC ARM7 MCU 144 BGA RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AT91 標(biāo)準(zhǔn)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(shè)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(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)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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