參數(shù)資料
型號： HT82K95A
廠商： Holtek Semiconductor Inc.
英文描述： USB Multimedia Keyboard Encoder 8-Bit MCU
中文描述： 的USB多媒體鍵盤編碼器8位微控制器
文件頁數(shù)： 17/48頁
文件大?。?/td> 319K
代理商： HT82K95A
HT82K95E/HT82K95A
Rev. 1.20
17
October 24, 2005
Low Voltage Reset
LVR
The microcontroller contains a low voltage reset circuit
inordertomonitorthesupplyvoltageofthedevice.Ifthe
supply voltage of the device drops to within a range of
0.9V~V
LVR
such as might occur when changing the bat-
tery, the LVR will automatically reset the device inter-
nally.
The LVR includes the following specifications:
For a valid LVR signal, a low voltage i.e. a voltage in
the range between 0.9V~V
LVR
must exist for greater
than 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
RES signal to perform chip reset.
TherelationshipbetweenV
DD
andV
LVR
isshownbelow.
Note:
V
OPR
is the voltage range for proper chip opera-
tion at 4MHz system clock.
Suspend Wake-Up and Remote Wake-Up
If there is no signal on the USB bus for over 3ms, the
HT82K95E/HT82K95A will go into 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
HT82K95E/HT82K95A should jump to the suspend
state to meet the 500 A USB suspend current spec.
In order to meet the 500 A suspend current, the firm-
ware should disable the USB clock by clearing the
USBCKEN (bit3 of the SCC) to 0 . The suspend cur-
rent is 400 A.
Usercanfurtherdecreasethesuspendcurrentto250 A
by setting the SUSP2 (bit4 of the SCC). But if the
SUSP2 is set, user should make sure not to enable the
LVR OPT option, otherwise the HT82K95E/HT82K95A
will be reset.
When the resume signal is sent out by the host, the
HT82K95E/HT82K95AwillwakeuptheMCUbyUSBin-
terrupt and the Resume line (bit 3 of the USC) is set. In
order to make the HT82K95E/HT82K95Afunction prop-
erly, the firmware must set the USBCKEN (bit 3 of the
SCC) to 1 and clear the SUSP2 (bit4 of the SCC).
Since the Resume signal will be cleared before the Idle
signal is sent out by the host, the Suspend line (bit 0 of
the USC) will be set to 0 . So when the MCU is detect-
ing the Suspend line (bit0 of USC), the Resume line
should be remembered and taken into consideration.
After finishing the resume signal, the suspend line will
go inactive and a USB interrupt is triggered. The follow-
ing is the timing diagram.
7 8 7 ,
9 8 9 ,
9 8 ,
8 : ,
,
,
,
) ,
7 8 7 ,
,
7 8 7 ,
,
) ,
8 : ,
,
#
;
; <
"
) ,
=
,
Low Voltage Reset
Note:
*1. To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
clock pulses before entering the normal operation.
*2. Since low voltage has to be maintained for over 1ms in its original state, therefore there s a 1ms delay
before entering the reset mode
相關(guān)PDF資料
PDF描述
HT82K95E USB Multimedia Keyboard Encoder 8-Bit MCU
HT82K96A USB Multimedia Keyboard Encoder 8-Bit Mask MCU
HT82K96E 8-Bit USB Multimedia Keyboard Encoder OTP MCU
HT82M21A 3-Key 3D USB+PS/2 Optical Mouse Controller
HT82M22 5-Key 3D USB+PS/2 Optical Mouse Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HT82K95AE 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU
HT82K95E 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU
HT82K95EE 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU
HT82K96A 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit Mask MCU
HT82K96E 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit USB Multimedia Keyboard Encoder OTP MCU
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