PT6964

V1.4

6

October 2009

PT6964 KEY MATRIX & KEY INPUT DATA STORAGE RAM

PT6964 Key Matrix consists of 10 x 2 array as shown below:

Each data entered by each key is stored as follows and read by a READ Command, starting from the last significant bit.

When the most significant bit of the data (b7) has been read, the least significant bit of the next data (b0) is read.

K1……………………...K2 K1………………………K2

Reading

Sequence

SG1/KS1

SG2/KS2

x

SG3/KS3

SG4/KS4

x

SG5/KS5

SG6/KS6

x

SG7/KS7

SG8/KS8

x

SG9/KS9

SG10/KS10

x

b0………………………b1

b3………………………..b4

b6………………………b7

Note: b6 and b7 do not care.

COMMANDS 3: ADDRESS SETTING COMMANDS

Address Setting Commands are used to set the address of the display memory. The address is considered valid if it has

a value of 00H to 0DH. If the address is set to 0EH or higher, the data is ignored until a valid address is set. When power

is turned ON, the address is set at 00H.

Please refer to the diagram below.

MSB

LSB

1

1

-

-

b3

b2

b1

b0

Not relevant

Address: 00H to 0DH

DISPLAY MODE AND RAM ADDRESS

Data transmitted from an external device to PT6964 via the serial interface are stored in the Display RAM and are

assigned addresses. The RAM addresses of PT6964 are given below in 8 bits unit.

SG1

SG4 SG5

SG8 SG9

SG10

X

SG12 SG13

SG14

00HL

00HU

01HL

-

01HU

DIG1

02HL

02HU

03HL

-

03HU

DIG2

04HL

04HU

05HL

-

05HU

DIG3

06HL

06HU

07HL

-

07HU

DIG4

08HL

08HU

09HL

-

09HU

DIG5

0AHL

0AHU

0BHL

-

0BHU

DIG6

0CHL

0CHU

0DHL

-

0DHU

DIG7

b0

b3

b4

b7

xxHL

xxHU

Lower 4 bits

Higher 4 bits

Note: X = Not relevant