HT8658 datasheet(7/15 Pages) HOLTEK

7 / 15 page

AS4

AS6

Function

Normal mode

AUTO PLAY mode

Not applicable

Notes: 1. “0” connects an external pull-low

resistor to ASn, where n=4, 6.

2. “1” connects no external pull-low

resistor to ASn, where n=4, 6.

System reset

The reset time of the HT8658 and HT8659 is

different. The HT8658 will reset the system if

the RES key is pressed more than 4 seconds and

reset the playing counter if the RES key is

pressed less than 4 seconds. The HT8659, on

the other hand, will reset the system if the RES

key is pressed over 2 seconds and reset the

playing counter if the key is pressed less than 2

seconds. Once the playing counter is reset, the

ICs will play back the recorded data from the

beginning by triggering the PLAY key. All of the

recorded data will be deleted after the system is

reset.

Indicate function

The HT8658/HT8659 provide an LEDB pin to

indicate the operation status of the LSI through

an external LED display. The LEDB pin is of

high impedance and an external LED is

switched off in the standby state. LEDB, on the

other hand, remains at a low level and LED is

turned on in the recording state. In the play-

back state, LED flashes with the volume of

output sounds. When the system is reset, it

flashes at a 2Hz rate.

HT8658/HT8659

26th Sep ’96

HT8658 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc