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參數(shù)資料
| 型號： | HT82K94E |
| 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)： | 17/44頁 |
| 文件大小： | 295K |
| 代理商： | HT82K94E |
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HT82K94E/HT82K94A
Rev. 1.00
17
November 22, 2005
optioned as CMOS/NMOS/PMOS configurations.
These control registers are mapped to locations 13H,
15H, 17H and 19H.
Afterachipreset,theseinput/outputlinesremainathigh
levels or floating state (depending on the pull-high op-
tions). Each bit of these input/output latches can be set
or cleared by SET [m].i and CLR [m].i (m=12H, 14H,
16H or 18H) instructions.
Some instructions first input data and then follow the
output operations. For example,
SET [m].i ,
CLR
[m].i , CPL [m] , CPLA [m] read the entire port states
into the CPU, execute the defined operations
(bit-operation), and then write the results back to the
latches or the accumulator.
Each line of all the I/O ports have the capability of wak-
ing up the device.
There are pull-high options available for I/O lines. Once
the pull-high option of an I/O line is selected, the I/O line
have pull-high resistor. Otherwise, the pull-high resistor
is absent. It should be noted that a non-pull-high I/O line
operating in input mode will cause a floating state.
It is recommended that unused or not bonded out I/O
linesshouldbesetasoutputpinsbysoftwareinstruction
to avoid consuming power under input floating state.
Low Voltage Reset/Detector
LVR/LVD
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.
There is a low voltage detector (LVD) and a low voltage
reset circuit (LVR) implemented in the microcontrollers.
Where LVR function can be enabled/disabled by op-
tions. User can read the LVD detector status (0/1) from
MISC.5. The LVR has the same effect or function with
the external RES signal which performs a chip reset.
Both LVR and LVD functions will disable in the HALT
mode.
There are two kind of LVR/LVD definition: 2-battery or
3-battery option.
When 2-battery option is selected: LVR=2.2V;
LVD=2.4V. Otherwise, 3-battery option is selected:
LVR=2.4V; LVD=2.6V.
/ 3 /
3
-
3 *
3
-
3
3 7
#
/ 3 /
/ 3 /
#
3 7
!
(
,
!
H
H
, (
!
#
(
(
,
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PDF資料 |
PDF描述 |
|---|---|
| HT82K94E_07 | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95AE | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95EE | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95A | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95E | USB Multimedia Keyboard Encoder 8-Bit MCU |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HT82K94E_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU |
| 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 |
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