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參數資料
| 型號： | HT82A821R |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | USB Audio MCU |
| 中文描述： | USB音頻控制器 |
| 文件頁數： | 15/39頁 |
| 文件大小： | 275K |
| 代理商： | HT82A821R |
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HT82A821R
Rev. 1.10
15
June 29, 2007
Low Voltage Reset
LVR (by ROM Code Option)
The LVR option is 3.0V.
The microcontroller provides low voltage reset circuit in
order to monitor the supply voltage of the device. If the
supply voltage of the device is within the range
0.9V~V
LVR
such as changing a battery, the LVR will au-
tomatically reset the device internally.
The LVR includes the following specifications:
The low voltage (0.9V~V
LVR
) has to remain in their
original state to exceed 1ms. If the low voltage state
does not exceed 1ms, the LVR will ignore it and do not
perform a reset function.
The
LVR
uses the OR function with the external
RESET signal to perform chip reset.
Suspend Wake-Up and Remote Wake-Up
If there is no signal on the USB bus for over 3ms, the
HT82A821R will go into a suspend mode. The Suspend
line (bit 0 of the USC) will be set to 1 and a USB inter-
rupt is triggered to indicate that the HT82A821R should
jumptothesuspendstatetomeettheUSBsuspendcur-
rent spec.
In order to meet the suspend current, the firmware
should disable the USB clock by clearing the USBCKEN
(bit3 of the UCC) to 0 .
Also the user can further decrease the suspend current
by set the SUSP2 (bit4 of the UCC).
When the resume signal is sent out by the host, the
HT82A821R will wake up the MCU by USB interrupt and
the Resume line (bit 3 of USC) is set. In order to make
HT82A821R work properly, the firmware must set the
USBCKEN (bit 3 of UCC) to 1 and clear the SUSP2 (bit4
of the UCC). Since the Resume signal will be cleared
before the Idle signal is sent out by the host and the Sus-
pend line (bit 0 of USC) is going to 0 . So when the
MCU is detecting the Suspend line (bit0 of USC), the
Resume line should be remembered and token into con-
sideration. The following is the timing diagram:
The device with remote wake up function can wake-up
the USB Host by sending a wake-up pulse through
RMWK (bit 1 of USC). Once the USB Host receive the
wake-up signal from HT82A821R, it will send a Resume
signal to device. The timing as follow:
'
, %
%
&
, C
'
, %
%
&
, C
- 1 -
- % %
, %
!
相關PDF資料 |
PDF描述 |
|---|---|
| HT82A821R_07 | USB Audio MCU |
| HT82A822R | USB Audio MCU |
| HT82A822R_07 | USB Audio MCU |
| HT82A832R | Basic USB Phone OTP MCU |
| HT82A850R | Audio MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT82A821R_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A822R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A822R_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A824R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A832R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
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