1. The POR will not work unless the supply voltage has been below V<" />
參數(shù)資料
型號: AT90USB647-MU
廠商: Atmel
文件頁數(shù): 61/106頁
文件大?。?/td> 0K
描述: IC AVR MCU 64K 64QFN
產(chǎn)品培訓(xùn)模塊: megaAVR Introduction
標(biāo)準(zhǔn)包裝: 1,300
系列: AVR®
應(yīng)用: USB 微控制器
核心處理器: AVR
程序存儲器類型: 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-VFQFN 裸露焊盤
包裝: 托盤
供應(yīng)商設(shè)備封裝: 64-VQFN(9x9)
配用: ATSTK600-TQFP64-ND - STK600 SOCKET/ADAPTER 64-TQFP
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
其它名稱: AT90USB647-16MU
AT90USB647-16MU-ND
Q4939729A
58
7593L–AVR–09/12
AT90USB64/128
Figure 9-1.
Reset logic.
Notes:
1. The POR will not work unless the supply voltage has been below VPOT (falling).
9.3
Power-on reset
A Power-on Reset (POR) pulse is generated by an on-chip detection circuit. The detection level
is defined in Table 9-1. The POR is activated whenever V
CC is below the detection level. The
POR circuit can be used to trigger the start-up reset, as well as to detect a failure in supply
voltage.
A Power-on Reset (POR) circuit ensures that the device is properly reset from Power-on if Vcc
started from V
POR with a rise rate upper than VCCRR. Reaching the Power-on Reset threshold
Table 9-1.
Reset characteristics.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
VPOT
Power-on reset threshold voltage (rising)
1.4
2.3
V
Power-on reset threshold voltage (falling) (1)
1.3
2.3
VPOR
VCC start voltage to ensure internal power-
on reset signal
-0.1
0.1
VCCRR
VCC rise rate to ensure internal power_on
reset signal
0.3
V/ms
VRST
RESET pin threshold voltage
0.2
VCC
0.85
VCC
V
tRST
Minimum pulse width on RESET Pin
5V, 25°C
400
ns
MCU status
register (MCUSR)
Brown-out
reset circuit
BODLEVEL [2..0]
Delay counters
CKSEL[3:0]
CK
TIMEOUT
WDRF
BORF
EXTRF
PORF
DATA BUS
Clock
generator
SPIKE
FILTER
Pull-up resistor
JTRF
JTAG reset
register
Watchdog
oscillator
SUT[1:0]
Power-on reset
circuit
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