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| 鍨嬭櫉锛� | PIC18F2450-I/ML |
| 寤犲晢锛� | Microchip Technology |
| 鏂囦欢闋佹暩(sh霉)锛� | 9/241闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC PIC MCU FLASH 8KX16 28QFN |
| 鐢�(ch菐n)鍝佸煿瑷撴ā濉婏細 | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 妯欐簴鍖呰锛� | 61 |
| 绯诲垪锛� | PIC® 18F |
| 鏍稿績铏曠悊鍣細 | PIC |
| 鑺珨灏哄锛� | 8-浣� |
| 閫熷害锛� | 48MHz |
| 閫ｉ€氭€э細 | UART/USART锛孶SB |
| 澶栧湇瑷倷锛� | 娆犲妾㈡脯/寰╀綅锛孒LVD锛孭OR锛孭WM锛學DT |
| 杓稿叆/杓稿嚭鏁�(sh霉)锛� | 23 |
| 绋嬪簭瀛樺劜鍣ㄥ閲忥細 | 16KB锛�8K x 16锛� |
| 绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 | 闁冨瓨 |
| RAM 瀹归噺锛� | 768 x 8 |
| 闆诲 - 闆绘簮 (Vcc/Vdd)锛� | 4.2 V ~ 5.5 V |
| 鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� | A/D 10x10b |
| 鎸暕鍣ㄥ瀷锛� | 鍏�(n猫i)閮� |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 灏佽/澶栨锛� | 28-VQFN 瑁搁湶鐒婄洡 |
| 鍖呰锛� | 绠′欢 |
| 鐢�(ch菐n)鍝佺洰閷勯爜闈細 | 646 (CN2011-ZH PDF) |
| 閰嶇敤锛� | AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN DM163025-ND - PIC DEM FULL SPEED USB DEMO BRD |
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106
XMEGA A [MANUAL]
8077I鈥揂VR鈥�11/2012
9.
Reset System
9.1
Features
Reset the microcontroller and set it to initial state when a reset source goes active
Multiple reset sources that cover different situations
鈥� Power-on reset
鈥� External reset
鈥� Watchdog reset
鈥� Brownout reset
鈥� PDI reset
鈥� Software reset
Asynchronous operation
鈥� No running system clock in the device is required for reset
Reset status register for reading the reset source from the application code
9.2
Overview
The reset system issues a microcontroller reset and sets the device to its initial state. This is for situations where
operation should not start or continue, such as when the microcontrollers operates below its power supply rating. If a
reset source goes active, the device enters and is kept in reset until all reset sources have released their reset. The I/O
pins are immediately tri-stated. The program counter is set to the reset vector location, and all I/O registers are set to
their initial values. The SRAM content is kept. However, if the device accesses the SRAM when a reset occurs, the
content of the accessed location can not be guaranteed.
After reset is released from all reset sources, the default oscillator is started and calibrated before the device starts
running from the reset vector address. By default, this is the lowest program memory address, 0, but it is possible to
move the reset vector to the lowest address in the boot section.
The reset functionality is asynchronous, and so no running system clock is required to reset the device. The software
reset feature makes it possible to issue a controlled system reset from the user software.
The reset status register has individual status flags for each reset source. It is cleared at power-on reset, and shows
which sources have issued a reset since the last power-on.
An overview of the reset system is shown in Figure 9-1 on page 107.
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