HTG12N0 datasheet(12/30 Pages) HOLTEK

12 / 30 page

Halt

This is a special feature of the HTG12N0 used to

interrupt the chip’s normal operation and re-

duce the power consumption. When a HALT is

executed the following happens ...

• The system clock will be stopped

• The contents of the on-chip RAM and regis-

ters remain unchanged

• RTC oscillator still keeps running

• BZ and BZ keep high level output

The system can quit the HALT mode by way of

initial reset or RTC interrupt or wake-up from

the following entry of program counter value.

Initial reset: 00H

Wake-up: next address of the HALT instruction

When the halt status is terminated by the RTC

interrupt, the following procedure takes place:

Case 1: If the system is in an interrupt-disable

state before entering the halt state:

• The system will awake and returns to the

main program instruction following the

HALT command.

• The RTC interrupt will be held until the sys-

tem receives an enable interrupt command by

which the RTC interrupt will be serviced.

Case 2: If the system is in an interrupt enable

state:

• The RTC interrupt will awake the system and

execute the RTC interrupt subroutine.

In the HALT mode, each bit of ports PM, PS, can

be used as wake-up signal by mask option to

wake-up the system. This signal is active in

low-going transition.

Sound effects

The HTG12N0 includes sound effect circuitry

which offers up to 16 sounds with 3 tones, boom

and noise effects. Holtek supports a sound li-

brary including melodies, alarms, machine guns etc..

Whenever the instruction “SOUND n” or

“SOUND A” is executed, the specified sound

begins. Each time “SOUND OFF” is executed, it

immediately terminates the singing sound.

There are two singing modes, SONE mode and

SLOOP mode activated by SOUND ONE and

SOUND LOOP. In SONE mode the specified

sound plays only once. In the SLOOP mode the

specified sound keeps re-playing.

Since sounds 0~11 contain 32 notes and sounds

12~15 include 64 notes, the latter possesses

better sound than the former.

The sound effect circuit frequency can be se-

lected by mask option.

Frequencyof sound effect circuit

system

clock

...where m=0,1,2,3,4,5.

Holtek’s sound library supports only sound

clock frequency 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 figure illustrates the mapping between the

display memory and LCD pattern for the

HTG12N0.

There is an ON/OFF switch for display control-

led by bit 1 of port PC (PC1). The corresponding

bit of the PC1 represents “ON” or “OFF” of the

LCD display memory.

The LCD display module may have any form as

long as the number of commons does not exceed

8 and the number of segments is not over 64.

HTG12N0

18th Mar ’99

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