Timing Diagrams

READ Mode (Command Code:110)

READ Mode (Successive Address Reading)

HT1622

Rev. 2.00

9

June 9, 2009

PATENTED

Command Format

The HT1622 can be configured by the software setting.

There are two mode commands to configure the

HT1622 resource and to transfer the LCD display data.

The following are the data mode ID and the command

mode ID:

Operation

Mode

ID

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 com-

mand mode ID can be omitted. While the system is op-

erating in a non-successive command or a

non-successive address data mode, the CS pin should

be set to

²1² and the previous operation mode will be re-

set 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

R D

D A T A

W R

1

1

0 A 5 A 4 A 3 A 2 A 1 A 0 D 0 D 1 D 2 D 3

M e m o r y A d d r e s s 1 ( M A 1 )

D a t a ( M A 2 )

1

1

0 A 5 A 4 A 3 A 2 A 1 A 0 D 0 D 1 D 2 D 3

D a t a ( M A 1 )

M e m o r y A d d r e s s 2 ( M A 2 )

C S

R D

D A T A

C S

W R

1

1

0 A 5 A 4 A 3 A 2 A 1 A 0 D 0 D 1 D 2 D 3

M e m o r y A d d r e s s ( M A ) D a t a ( M A )

D 0 D 1 D 2 D 3 D 0 D 1 D 2 D 3 D 0 D 1 D 2 D 3 D 0

D a t a ( M A + 1 ) D a t a ( M A + 2 ) D a t a ( M A + 3 )