參數(shù)資料
型號(hào)： 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(yè)數(shù)： 10/27頁(yè)
文件大?。?/td> 427K
代理商： HTG1390
Halt
This is a special feature of the HTG1390. It will
stop the chip’s normal operation and reduce
power consumption. When the instruction
“HALT” is executed, then
The system clock will be stopped
The contents of the on-chip RAM and regis-
ters remain unchanged
LCD segments and commons keep 2VDD volt-
age (i.e. LCD becomes blank)
The system can escape HALT mode by ways of
initial reset or external interrupt and wake-up
from the following entry of program counter
value.
Initial reset: 000H.
Interrupt (enabled): 008H
Interrupt (disabled): next address of HALT
instruction.
In HALT mode, each bit of port PS, PP0~PP2,
can be used as external interrupt by mask op-
tion to wake-up system. This signal is active in
low-going transition.
Sound effects
The HTG1390 includes sound effect circuitry
which offers up to 16 sounds with 3 tone, boom
and noise effects. Holtek supports a sound li-
brary which has melodies, alarms, machine
guns etc..
Whenever the instruction “SOUND n” or
“SOUND A” is executed, the specified sound
will begin. Whenever “SOUND OFF” is exe-
cuted, it terminates the singing sound immedi-
ately.
There are two singing modes, SONE mode and
SLOOP mode activated by SOUND ONE and
SOUND LOOP. In SONE mode the specified
sound plays just once. In SLOOP mode the
specified sound keeps re-playing.
Since sounds 0~11 contain 32 notes and sounds
12~15 contain 64 notes the latter possesses bet-
ter sound than the former.
The frequency of the sound effect circuit can be
selected by mask option.
Frequency of sound effect circuit
=
system
clock
2
m
...where m=0,1,2,3,4,5.
Holtek’s sound library supports only sound
clock frequencies of 128K or 64K . To use
Holtek’s sound library the proper system clock
and mask option should be selected.
LCD display memory
As mentioned in the data memory section the
LCD display memory is embedded in the data
memory. It can be read and written to in the
same way as normal data memory.
The figures show the mapping between the dis-
play memory and L C D pattern for the
HTG1390.
To turn the display on or off a 1/0 is written to
the corresponding bit of the display memory.
The LCD display module may have any form as
long as the number of commons does not exceed
3 and the number of segments does not exceed
27.
LCD display memory
HTG1390
Preliminary
10
17th Nov ’98
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