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| 型號(hào)： | AT91SAM9XE512-QU |
| 廠(chǎng)商： | Atmel |
| 文件頁(yè)數(shù)： | 91/159頁(yè) |
| 文件大小： | 0K |
| 描述： | MCU ARM9 512K FLASH 208-PQFP |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction |
| 標(biāo)準(zhǔn)包裝： | 24 |
| 系列： | SAM9XE |
| 核心處理器： | ARM9 |
| 芯體尺寸： | 16/32-位 |
| 速度： | 180MHz |
| 連通性： | EBI/EMI，以太網(wǎng)，I²C，MMC，SPI，SSC，UART/USART，USB |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 96 |
| 程序存儲(chǔ)器容量： | 512KB（512K x 8） |
| 程序存儲(chǔ)器類(lèi)型： | 閃存 |
| RAM 容量： | 56K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 4x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 208-MQFP，208-PQFP |
| 包裝： | 托盤(pán) |
| 配用： | AT91SAM9XE-EK-ND - KIT EVAL FOR AT91SAM9XE AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9 |
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2007 Microchip Technology Inc.
DS41213D-page 25
PIC16F5X
5.1
Power-on Reset (POR)
The PIC16F5X family of devices incorporate on-chip
Power-on Reset (POR) circuitry which provides an
internal chip Reset for most power-up situations. To
use this feature, the user merely ties the MCLR/VPP pin
to VDD. A simplified block diagram of the on-chip
Power-on Reset circuit is shown in Figure 5-1.
The Power-on Reset circuit and the Device Reset
Timer (Section 5.2) circuit are closely related. On
power-up, the Reset latch is set and the DRT is reset.
The DRT timer begins counting once it detects MCLR
to be high. After the time-out period, which is typically
18 ms, it will reset the Reset latch and thus end the on-
chip Reset signal.
A power-up example where MCLR is not tied to VDD is
before bringing MCLR high. The chip will actually come
out of Reset TDRT msec after MCLR goes high.
In Figure 5-4, the on-chip Power-on Reset feature is
being used (MCLR and VDD are tied together). The VDD
is stable before the start-up timer times out and there is
no problem in getting a proper Reset. However,
too slowly. The time between when the DRT senses a
high on the MCLR/VPP pin and the MCLR/VPP pin (and
VDD) actually reach their full value is too long. In this sit-
uation, when the start-up timer times out, VDD has not
reached the VDD (min) value and the chip is, therefore,
not ensured to function correctly. For such situations,
we recommend that external RC circuits be used to
achieve longer POR delay times (Figure 5-2).
For more information on the PIC16F5X POR, see
Application Note AN522, “Power-Up Considerations”
at www.microchip.com.
FIGURE 5-2:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW VDD POWER-UP)
Note 1: When the device starts normal operation
(exits
the
Reset
condition),
device
operating
parameters
(voltage,
fre-
quency, temperature, etc.) must be met to
ensure operation. If these conditions are
not met, the device must be held in Reset
until the operating conditions are met.
2: The POR is disabled when the device is
in Sleep.
C
R1
R
D
MCLR
PIC16F5X
VDD
External Power-on Reset circuit is required
only if VDD power-up is too slow. The diode D
helps discharge the capacitor quickly when
VDD powers down.
R < 40 k
Ω is recommended to make sure that
voltage drop across R does not violate the
device electrical specification.
R1 = 100
Ω to 1 kΩ will limit any current
flowing into MCLR from external capacitor C
in the event of MCLR pin breakdown due to
Electrostatic Discharge (ESD) or Electrical
Overstress (EOS).
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| AT91SAM9XE-EK | 功能描述:開(kāi)發(fā)板和工具包 - ARM Eval Kit for SAM9XE Series RoHS:否 制造商:Arduino 產(chǎn)品:Development Boards 工具用于評(píng)估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類(lèi)型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V |
| AT91SAM-ICE | 功能描述:仿真器/模擬器 JTAG emulator AT91 ARM7/ARM9 RoHS:否 制造商:Blackhawk 產(chǎn)品:System Trace Emulators 工具用于評(píng)估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2 |
| AT91SAMS64-AI | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:AT91 ARM㈢ Thumb㈢-based Microcontrollers |
| AT91SC192192CT-USB | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:32-bit Secure Microcontrollers |
| AT91SC25672RC | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:32-bit Secure Microcontroller for Smart Cards |
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