HTG1390 Просмотр технического описания (PDF) - Holtek Semiconductor

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HTG1390

4-bit Microcontroller

Holtek Semiconductor 

Preliminary

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

2m

...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 LCD 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

10

17th Nov ’98

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