HT1623 datasheet(10/18 Pages) HOLTEK

10 / 18 page

HT1623

April 21, 2000

If an external clock is selected as the source of

system frequency, the SYS DIS command turns

out invalid and the power down mode fails to be

carried out until the external clock source is re-

moved.

Buzzer tone output

A simple tone generator is implemented in the

HT1623. The tone generator can output a pair

of differential driving signals on the BZ and BZ

which are used to generate a single tone.

Command format

The HT1623 can be configured by the software

setting. There are two mode commands to con-

figure the HT1623 resource and to transfer the

LCD display data.

The following are the data mode ID and the

command mode ID:

Operation

Mode

READ

Data

1 1 0

WRITE

Data

1 0 1

READ-MODIFY-WRITE

Data

1 0 1

COMMAND

Command 1 0 0

If successive commands have been issued, the

command mode ID can be omitted. While the

system is operating in the non-successive com-

mand or the non-successive address data mode,

the CS pin should be set to ²1² and the previous

operation mode will be reset also. The CS pin

returns to ²0², a new operation mode ID should

be issued first.

Name

Command Code

Function

TONE OFF

0000-1000-X

Turn-off tone output

TONE 4K

010X-XXXX-X

Turn-on tone output, tone frequency is 4kHz

TONE 2K

0110-XXXX-X

Turn-on tone output, tone frequency is 2kHz

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