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PDF HTG1390 Data sheet ( Hoja de datos )
| Número de pieza | HTG1390 | |
| Descripción | 4-bit Microcontroller | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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Preliminary
HTG1390
4-bit Microcontroller
Features
• Operating voltage: 1.2V~1.8V
• 7 input lines
• 3 output lines
• Halt feature reduces power consumption
• Up to 16µs instruction cycle with 256kHz
system clock at VDD=1.5V
• All instructions in 1 or 2 machine cycles
• 4K×8 program ROM
• Data memory RAM size 128×4 bits
General Description
The HTG1390 is the processor from Holtek’s
4-bit stand alone single chip microcontroller
range specifically designed for LCD product ap-
plications. The device is ideally suited for mul-
• 27×3 segment LCD driver
• 8-bit table read instruction
• 5 working registers
• Internal timer overflow interrupt
• One level subroutine nesting
• RC oscillator for system clock
• 8-bit timer with internal clock source
• Sound effect circuit
tiple LCD low power applications among which
are calculators, scales, and hand held LCD
products.
1 17th Nov ’98
1 page  
Preliminary
HTG1390
Pad Description
Pad No. Pad Name I/O Mask Option
Function
17, 18 BZ,BZ
O Note 1 Sound effect outputs
8 TEST1
9 TEST2
For test mode only
I
I
—
TEST1 and TEST2 are left open when the
HTG1390 is in normal operation (with an internal
pull high resistor).
5~7
COM2~COM0 O
Note 2 Output for LCD panel common plate
10~13 PS3~PS0
I
Pull-high or
None. Note 3
4-bit port for input only
16 VSS
I — Negative power supply, GND
15 OSCI
14 OSCO
I
O
—
OSCI,OSCO are connected to an external resistor
for an internal system clock
19~21 PA2~PA0
CMOS or
O NMOS Open 3-bit latch port for output only
Drain
22~24 PP0~PP2
I
Pull-high or
None. Note 2
3-bit port for input only
25 RES
I
—
Input to reset an internal LSI
Reset is active on logical low level
26~52 SEG0~SEG26 O
— LCD driver outputs for LCD panel segment
1 VDD
I — Positive power supply
4 V3
I — LCD system power 1/2 bias generated
2, 3 C1, C2
I
—
LCD system voltage booster condensor connecting
terminal
Notes: The system clock provides 6 different sources selectable by mask option to drive the sound
effect clock. If the Holtek sound library is used only 128K and 64K are acceptable.
Each bit of ports PS and PP can be a trigger source of the HALT interrupt, selectable by mask
option.
Absolute Maximum Ratings*
Supply Voltage ................................. –0.3V~5.5V
Storage Temperature.................... –50°C~125°C
Input Voltage.....................VSS–0.3V~VDD+0.3V
Operating Temperature...................... 0°C~70°C
*Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maxi-
mum Ratings” may cause substantial damage to the device. Functional operation of this
device at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
5 17th Nov ’98
5 Page 
Preliminary
HTG1390
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.
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.
LCD driver output
Note: VLCD is produced by double voltage
circuit, therefore its value is double by
VDD.
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 TIMER.
One HTG1390 machine cycle consists of a se-
quence of 4 states numbered T1 to T4. Each
state lasts for one oscillator period. The ma-
chine cycle is 16µs if the system frequency is up
to 256kHz.
Input ports PP and PS
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.
RC oscillator
Output port PA
11 17th Nov ’98
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet HTG1390.PDF ] | |
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