HT815D0 datasheet(9/15 Pages) HOLTEK

9 / 15 page

HT815D0

March 15, 2000

Level trigger

When one of the 12 keys is pressed and held

down, the corresponding group will keep

playing. Once the pressed key is released,

the group will not stop till the included sec-

tions are all completed.

Level hold

When one of the 12 keys is pressed and held

down, the group corresponding to that held

key will play. When the pressed key is re-

leased, the group will immediately stop re-

gardless of the rest.

FLAG

When voices are playing, both FLAG1 and

FLAG2 pins are activated to output one of the

following signals through code option.

FLAG1 can be optioned as one of the following

signal outputs:

None, 3HzB flash, Busy, 6HzB flash, Voice indica-

tor, or End-pulse output

FLAG2, on the other hand, can be set as one of

the following signal outputs:

None, 3Hz flash, 6Hz flash, or Busy output

· 3Hz/3HzB flash

When voices are playing, the FLAG1 as well

as FLAG2 pins output a 3Hz signal to drive

an LED. The signal is active low, 25% duty.

Once the voice output is terminated, the

FLAG1 and FLAG2 pins become floating out-

puts. When the FLAG1 and the FLAG2 pins

are optioned as 3HzB and 3Hz outputs, they

will be alternately output at a 3Hz rate.

· 6Hz/6HzB flash

When voices are playing, the FLAG1 pin

outputs a 6Hz signal to drive an LED. The

signal is active low, 25% duty. Once the voice

output is terminated, the FLAG1 pin be-

comes a floating output. When the FLAG1

and the FLAG2 pins are optioned as 6HzB

and 6Hz outputs, they will be alternately

output at a 6Hz rate.

· Busy output

When a voice group is playing, the outputs of

both FLAG1 and FLAG2 are turned low, indi-

cating that the chip is busy.

In addition to the above-stated output sig-

nals, FLAG1 can also generate one of the fol-

lowing signals by code option:

G rou p N

KE Y N

AU D

G rou p N

KE Y N

AU D

FL A G

: F l oat i n g

AU D

FL A G

: F l oat i n g

AU D

FL A G

: F l oat i n g

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