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HT82K94E Folha de dados(PDF) 18 Page - Holtek Semiconductor Inc

Nome de Peças HT82K94E
Descrição Electrónicos  USB Multimedia Keyboard Encoder 8-Bit MCU
Download  43 Pages
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT82K94E Folha de dados(HTML) 18 Page - Holtek Semiconductor Inc

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HT82K94E/HT82K94A
Rev. 2.40
18
November 5, 2014
optioned as CMOS/NMOS/PMOS configurations.
These control registers are mapped to locations 13H,
15H, 17H and 19H.
After a chip reset, these input/output lines remain at high
levels or floating state (depending on the pull-high op-
tions). Each bit of these input/output latches can be set
or cleared by
²SET [m].i² and ²CLR [m].i² (m=12H, 14H,
16H or 18H) instructions.
Some instructions first input data and then follow the
output operations. For example,
²SET [m].i², ²CLR
[m].i
², ²CPL [m]², ²CPLA [m]² 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
lines should be set as output pins by software instruction
to avoid consuming power under input floating state.
Low Voltage Reset/Detector
- LVR/LVD
The microcontroller contains a low voltage reset circuit
in order to monitor the supply voltage of the device. If the
supply voltage of the device drops to within a range of
0.9V~VLVR 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~VLVR 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
²OR² function with the external
RES signal to perform chip reset.
The relationship between VDD and VLVR is shown below.
Note:
VOPR 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.
5 . 5 V
2 . 2 V ~ 2 . 4 V
2 . 0 V ~ 2 . 2 V
0 . 9 V
V D D
V O P R
V L V R
5 . 5 V
V D D
5 . 5 V
V L V R
0 . 9 V
0 V
R e s e t S i g n a l
R e s e t
* 1
* 2
N o r m a l O p e r a t i o n
R e s e t
L V R D e t e c t V o l t a g e
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


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