HT812L0 データシートの表示（PDF） - Holtek Semiconductor

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HT812L0

2.8 Second Enhanced Tone Voice

Holtek Semiconductor 

HT812L0

• Trigger mode

♦ Retriggerable

When a group is playing corresponding to a

momentarily triggered key, any further key

input can terminate the currently playing

group and start playing the group corre-

sponding to the newly triggered key. How-

ever, if a group of KEY1~KEY8 is playing

but the key corresponding to the playing

group is still held down, whether the cur-

rently playing group will be forcefully

stopped or not, depends on the key priority,

namely;

KEY1>KEY2> KEY3>KEY4…>KEY8.

♦ Non-retriggerable

In the non-retriggerable mode, when one of

the 8 keys (KEY1~KEY8) is pressed, the

corresponding group will not start playing

till the currently playing group is com-

pleted.

AUD

The AUD pin is a PMOS open drain structure.

It outputs voice and tone signals to drive a

speaker through an external NPN transistor

when the chip is active. However, the AUD pin

becomes a floating output when the chip is in

the standby state.

The 8050 type transistor with hFE≅150 is rec-

ommended for an output driver.

System oscillator

The HT812L0 has an RC oscillator which re-

quires only one external resistor for normal

applications. The oscillator frequency is typi-

cally 96kHz for an external resistor.

The oscillator is turned on when triggered by a

key input. After playing, the oscillator is turned

off and the chip goes into the standby state.

Mask options

The HT812L0 provides the following mask op-

tions for different applications. Before manu-

facture, all of the options must be defined to

enable a proper system of operation.

• Mask options for keys:

♦ Keys debounce time: 22ms/45ms

♦ Pull-high resistor: 20kΩ/50kΩ/100kΩ

♦ Trigger function: Level hold/One shot/Level

trigger

♦ Direct key or matrix key (4×4)

♦ Normal or two pages (Direct key=16 trigger,

matrix key=32 trigger)

• FLAG2 outputs: 3Hz/sound level/busy/endp

(Mask option)

♦ 3Hz flash

When voices are playing, the FLAG LED

flashes with a 3Hz rate. The LED turned on

duty is 25%.

In the standby state, the FLAG pin is a floating

output.

6

5th May ’98

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