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參數資料
| 型號： | HT82A851R |
| 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： | 16/43頁 |
| 文件大小： | 304K |
| 代理商： | HT82A851R |
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HT82A851R
Rev. 1.20
16
June 15, 2007
LowVoltageReset
LVR(byConfigurationOption)
The LVR option is 3.0V.
The microcontroller provides a low voltage reset circuit
inordertomonitorthesupplyvoltageofthedevice.Ifthe
supply voltage of the device is within the range
0.9V~V
LVR
, the LVR will automatically reset the device
internally.
The LVR includes the following specifications:
The low voltage (0.9V~V
LVR
) condition has to remain
in its condition for a time exceeding 1ms. If the low
voltage state does not exceed 1ms, the LVR will ig-
nore it and will not perform a reset function.
The
LVR
uses the OR function with the external
RESET signal to perform a chip reset.
Suspend Wake-Up and Remote Wake-Up
If there is no signal on the
USB
bus for over 3ms, the
HT82A851R will go into a suspend mode. The Suspend
line (bit 0 of the USC) will be set to 1 and a
USB
interrupt is triggered to indicate that the HT82A851R
should jump to the suspend state to meet the
requirements of the
USB
suspend current spec.
In order to meet the requirements of the suspend
current, the firmware should disable the
USB
clock by
clearing USBCKEN (bit3 of UCC) to 0 .
Also the user can further decrease the suspend current
by setting SUSP2 (bit4 of the UCC).
When the resume signal is sent out by the host, the
HT82A851R will be woken up by the USB interrupt and
the Resume line (bit 3 of USC) will be set. In order to
make the HT82A851R work properly, the firmware must
set USBCKEN (bit 3 of UCC) to 1 and clear SUSP2
(bit4 of the UCC). Since the Resume signal will be
cleared before the Idle signal is sent out by the host and
the Suspend line (bit 0 of USC) will go to 0 . So when
the MCU is detecting the Suspend line (bit0 of USC), the
condition of the Resume line should be noted and taken
into consideration.
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 receives the
wake-up signal from the HT82A851R, it will send a
Resume signal to the device. The timing is as follows:
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