HT817D0 datasheet(9/15 Pages) HOLTEK

9 / 15 page

HT817D0

March 15, 2000

Level hold

When one of the 12 keys is pressed and held

down, the group corresponding to that held

key will play until the pressed key is re-

leased, then the group will immediately

stop regardless 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 pin outputs 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 FLAG1 and

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.

AU D

FL A G

: F l oat i n g

AU D

FL A G

: F l o a t i n g

AU D

FL A G

: F l oat i n g

G roup N

KE Y N

AU D

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