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參數(shù)資料
| 型號(hào)： | AT91SAM7X-EK |
| 廠商： | Atmel |
| 文件頁數(shù)： | 18/44頁 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR AT91SAM7X256/128 |
| 產(chǎn)品培訓(xùn)模塊： | AT91SAM7X and SAM7XC Flash-based Microcontrollers MCU Product Line Introduction |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | AT91SAM 智能 ARM |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | AT91SAM7X256，AT91SAM7X128 |
| 所含物品： | 板，線纜，DVD，電源 |
| 相關(guān)產(chǎn)品： | AT91SAM7X256-CU-999-ND - IC MCU ARM7 256KB FLASH 100TFBGA AT91SAM7X128-CU-999-ND - IC MCU ARM7 128KB FLASH 100TFBGA AT91SAM7X128-AU-999-ND - IC MCU ARM7 128KB FLASH 100LQFP AT91SAM7X512-CU-ND - MCU ARM 512K HS FLASH 100-TFBGA AT91SAM7X512-AU-ND - MCU ARM 512K HS FLASH 100-LQFP AT91SAM7X256-CU-ND - MCU ARM 256K HS FLASH 100-TFBGA AT91SAM7X128-CU-ND - MCU ARM 128K HS FLASH 100-TFBGA AT91SAM7X256-AU-999TR-ND - IC ARM7 MCU 256K FLASH 100-LQFP AT91SAM7X256-AU-ND - IC ARM7 MCU FLASH 256K 100LQFP AT91SAM7X128-AU-ND - IC ARM7 MCU FLASH 128K 100LQFP |
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6120GS–ATARM–07-Apr-11
SAM7X512/256/128 Summary
9.1
Reset Controller
Based on one power-on reset cell and one brownout detector
Status of the last reset, either Power-up Reset, Software Reset, User Reset, Watchdog
Reset, Brownout Reset
Controls the internal resets and the NRST pin output
Allows to shape a signal on the NRST line, guaranteeing that the length of the pulse meets
any requirement.
9.1.1
Brownout Detector and Power-on Reset
The SAM7X512/256/128 embeds one brownout detection circuit and a power-on reset cell. The
power-on reset is supplied with and monitors VDDCORE.
Both signals are provided to the Flash to prevent any code corruption during power-up or power-
down sequences or if brownouts occur on the power supplies.
The power-on reset cell has a limited-accuracy threshold at around 1.5V. Its output remains low
during power-up until VDDCORE goes over this voltage level. This signal goes to the reset con-
troller and allows a full re-initialization of the device.
The brownout detector monitors the VDDCORE and VDDFLASH levels during operation by
comparing them to a fixed trigger level. It secures system operations in the most difficult environ-
ments and prevents code corruption in case of brownout on the VDDCORE or VDDFLASH.
When the brownout detector is enabled and VDDCORE decreases to a value below the trigger
level (Vbot18-, defined as Vbot18 - hyst/2), the brownout output is immediately activated.
When VDDCORE increases above the trigger level (Vbot18+, defined as Vbot18 + hyst/2), the
reset is released. The brownout detector only detects a drop if the voltage on VDDCORE stays
below the threshold voltage for longer than about 1s.
The VDDCORE threshold voltage has a hysteresis of about 50 mV, to ensure spike free brown-
out detection. The typical value of the brownout detector threshold is 1.68V with an accuracy of
± 2% and is factory calibrated.
When the brownout detector is enabled and VDDFLASH decreases to a value below the trigger
level (Vbot33-, defined as Vbot33 - hyst/2), the brownout output is immediately activated.
When VDDFLASH increases above the trigger level (Vbot33+, defined as Vbot33 + hyst/2), the
reset is released. The brownout detector only detects a drop if the voltage on VDDCORE stays
below the threshold voltage for longer than about 1s.
The VDDFLASH threshold voltage has a hysteresis of about 50 mV, to ensure spike free brown-
out detection. The typical value of the brownout detector threshold is 2.80V with an accuracy of
± 3.5% and is factory calibrated.
The brownout detector is low-power, as it consumes less than 28 A static current. However, it
can be deactivated to save its static current. In this case, it consumes less than 1A. The deac-
tivation is configured through the GPNVM bit 0 of the Flash.
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| AT91SAM9260 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM Thumb Microcontrollers |
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| AT91SAM9260B-CFU | 功能描述:ARM微控制器 - MCU 32-bit 0.5mm pitch 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(shí)鐘頻率:72 MHz 程序存儲(chǔ)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 |
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