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參數(shù)資料
| 型號： | HTG1390 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 4-bit Microcontroller |
| 中文描述： | 4位微控制器 |
| 文件頁數(shù)： | 11/27頁 |
| 文件大小： | 427K |
| 代理商： | HTG1390 |
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LCD driver output
All LCD segments are random after an initial
clear. The bias voltage circuits of the LCD dis-
play is built-in and no external resistor is
needed.
The output number of the HTG1390 LCD driver
is 27
×
3 which can directly drive an LCD with
1/3 duty cycle and 1/2 bias.
The frequency of the LCD driving clock is fixed
at about 128Hz. This is set by Holtek according
to the application and cannot be changed.
Note:
circuit, therefore its value is double by
VDD.
VLCD is produced by double voltage
Oscillator
Only one external resistor is needed for the
HTG1390 oscillator circuit.
The system clock is also used as the reference
signal of the LCD driving clock, sound effect
clock and internal frequency source of TIME R.
One HTG1390 machine cycle consists of a se-
quence of 4 states numbered T1 to T4. E ach
state lasts for one oscillator period. The ma-
chine cycle is 16
μ
s if the system frequency is up
to 256kHz.
Interfacing
The HTG1390 microcontroller communicate
with the outside world through 4-bit input port
PS, 3-bit input port PP and one 4-bit output port
PA.
Input ports – PP, PS
All ports can have internal pull high resistors
determined by mask option. Every bit of the
input ports PP and PS can be specified to be a
trigger source to wake up the HALT interrupt
by mask option . A high to low transition on one
of these pins will wake up the device from a
HALT status.
Output port – PA
A mask option is available to select whether the
output is a CMOS or open drain NMOS type.
After an initial clear the output port PA defaults
to be high for CMOS or floating for NMOS.
LCD driver output
Input ports PP and PS
RC oscillator
Output port PA
HTG1390
Preliminary
11
17th Nov ’98
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相關(guān)代理商/技術(shù)參數(shù) |
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| HTG1395 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:3-in-1 LCD Game |
| HTG13A0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
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| HTG13J0 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:4-Bit Microcontroller |
| HTG13Q0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
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