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參數(shù)資料
| 型號： | AT91SAM7XC256-CU-999 |
| 廠商： | Atmel |
| 文件頁數(shù)： | 20/47頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU ARM7 256KB FLASH 100TFBGA |
| 產(chǎn)品培訓(xùn)模塊： | SAM9 MPU Boot Solutions & Application Deployment AT91SAM7X and SAM7XC Flash-based Microcontrollers MCU Product Line Introduction |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 系列： | SAM7XC |
| 核心處理器： | ARM7 |
| 芯體尺寸： | 16/32-位 |
| 速度： | 55MHz |
| 連通性： | CAN，以太網(wǎng)，I²C，SPI，SSC，UART/USART，USB |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，DMA，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 62 |
| 程序存儲器容量： | 256KB（256K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 64K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 100-TFBGA |
| 包裝： | 帶卷 (TR) |
| 配用： | AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9 AT91SAM7XC-EK-ND - KIT EVAL FOR AT91SAM7XC256/128 |
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6209DS–ATARM–17-Feb-09
AT91SAM7XC512/256/128
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 AT91SAM7XC512/256/128 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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