參數(shù)資料
型號： AT43USB325E-AC
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Multimedia USB Keyboard Controller with Embedded Hub
中文描述： 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP64
封裝： 1.40 MM HEIGHT, PLASTIC, MS-026-ACB, LQFP-64
文件頁數(shù)： 92/109頁
文件大?。?/td> 643K
代理商： AT43USB325E-AC
92
3355C–USB–4/05
AT43USB325
8.5
Suspend and Resume
The AT43USB325 enters suspend only when requested by the USB host through bus inactivity
for at least 3 ms. The USB hardware would detect this request, sets the GLB_SUSP bit of
SPRSR, Suspend/Resume Register, and interrupts the microcontroller if the interrupt is enabled.
The microcontroller should shut down any peripheral activity and enter the Power Down mode
by setting the SE and SM bits of MCUCR and then executes the SLEEP instruction. The USB
hardware shuts off the oscillator and PLL.
8.5.1
Global Resume
Global resume is signaled by a J to K state change on Port0. The USB hardware enables the
oscillator/PLL, propagates the RESUME signaling, and sets the RSM bit of the SPRSR, which
generates an interrupt. The microcontroller starts executing where it left off and services the
interrupt. As part of the ISR, the firmware clears the GLB_SUSP bit.
8.5.2
Remote Wakeup
While the AT43USB325 is in global suspend, resume signaling is also possible through remote
wakeup if the remote wakeup feature is enabled. Remote wakeup is defined as a port connect,
port disconnect or resume signaling received at a downstream port or, in case of the embedded
function, through an external interrupt.
A remote wakeup initiated at a downstream port is similar in many respects to a global resume.
The USB hardware enables the oscillator/PLL, propagates the RESUME signaling, and sets the
RSM bit of the SPRSR which generates an interrupt. The microcontroller starts executing where
it left off and services the interrupt. As part of the ISR, the firmware clears the GLB_SUSP bit.
A remote wakeup from the embedded function is initiated through INT0 or the external interrupt,
INT1, which enables the oscillator/PLL and the USB hardware. The USB hardware drives
RESUME signaling and sets the FRMWUP and RSM bits of SPRSR which generates an inter-
rupt to the microcontroller. The microcontroller starts executing where it left off and services the
interrupt. As part of the ISR, the firmware clears the GLB SUSP bit.
At completion of RESUME signaling, the USB hardware sets the Port Suspend Status Change
bits of the Hub Port Status Change Registers.
8.5.3
Selective Suspend and Resume
See section on Hub Port Control Register, HPCON.
相關(guān)PDF資料
PDF描述
AT43USB325E-AU Multimedia USB Keyboard Controller with Embedded Hub
AT43USB326-AC Multimedia USB Keyboard Controller with Embedded Hub
AT43USB326-AU Multimedia USB Keyboard Controller with Embedded Hub
AT43USB351M-AC Full-speed/Low-speed USB Microcontroller with ADC and PWM
AT43USB353M-AC Low Cost Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT43USB325E-AU 功能描述:USB 接口集成電路 USB KEYBOARD CONTROL w/HUB - IND TEMP RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
AT43USB326 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset
AT43USB326_06 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Multimedia USB Keyboard Controller with Embedded Hub
AT43USB326-AC 功能描述:USB 接口集成電路 USB KEYBOARD F/LOGI- TECH - COM TEMP RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
AT43USB326-AU 功能描述:USB 接口集成電路 USB KEYBOARD FOR LOGITECH - IND TEMP RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
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