參數(shù)資料
型號: AT90USB647-AU
廠商: Atmel
文件頁數(shù): 60/106頁
文件大?。?/td> 0K
描述: IC AVR MCU 64K 64TQFP
產(chǎn)品培訓(xùn)模塊: megaAVR Introduction
標(biāo)準(zhǔn)包裝: 450
系列: AVR®
應(yīng)用: USB 微控制器
核心處理器: AVR
程序存儲(chǔ)器類型: 閃存(64 kB)
控制器系列: AT90 USB
RAM 容量: 4K x 8
接口: 2 線串行,SPI 串行,USART,USB
輸入/輸出數(shù): 48
電源電壓: 2.7 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-TQFP,64-VQFP
包裝: 托盤
供應(yīng)商設(shè)備封裝: 64-TQFP
配用: ATSTK600-RC17-ND - STK600 ROUTING CARD AVR
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
其它名稱: AT90USB647-16AU
AT90USB647-16AU-ND
57
7593L–AVR–09/12
AT90USB64/128
9.
System control and reset
9.1
Resetting the AVR
During reset, all I/O Registers are set to their initial values, and the program starts execution
from the Reset Vector. The instruction placed at the Reset Vector must be a JMP – Absolute
Jump – instruction to the reset handling routine. If the program never enables an interrupt
source, the Interrupt Vectors are not used, and regular program code can be placed at these
locations. This is also the case if the Reset Vector is in the Application section while the Interrupt
Vectors are in the Boot section or vice versa. The circuit diagram in Figure 9-1 on page 58
shows the reset logic. Table 9-1 on page 58 defines the electrical parameters of the reset
circuitry.
The I/O ports of the AVR are immediately reset to their initial state when a reset source goes
active. This does not require any clock source to be running.
After all reset sources have gone inactive, a delay counter is invoked, stretching the internal
reset. This allows the power to reach a stable level before normal operation starts. The time-out
period of the delay counter is defined by the user through the SUT and CKSEL Fuses. The dif-
ferent selections for the delay period are presented in “Clock sources” on page 41.
9.2
Reset sources
The Atmel AT90USB64/128 has five sources of reset:
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset
threshold (V
POT)
External Reset. The MCU is reset when a low level is present on the RESET pin for longer
than the minimum pulse length
Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and the
Watchdog is enabled
Brown-out Reset. The MCU is reset when the supply voltage V
CC is below the Brown-out
Reset threshold (V
BOT) and the Brown-out Detector is enabled
JTAG AVR Reset. The MCU is reset as long as there is a logic one in the Reset Register, one
of the scan chains of the JTAG system. Refer to Section “IEEE 1149.1 (JTAG) boundary-
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