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PT6301
(Rev.:2012)

5 x 7 Dot Character x 20-Digit x 2-Line Display Controller/Driver with Character RAM

Princeton Technology 

PT6301

DATA TRANSFER METHOD AND COMMAND WRITE METHOD

Display control command and data are written by an 8-bit serial transfer.

Write timing is shown in the figure below.

Setting the CS pin to “Low” level enables a data transfer.

Data is 8 bits and is sequentially input into the DA pin from LSB (LSB first).

As shown in the figure below, data is read by the shift register at the rising edge of the shift clock, which is input into the

CP pin. If 8-bit data is input, internal load signals are automatically generated and data is written to each register and

RAM.

Therefore it is not necessary to input load signals from the outside.

Setting the CS pin to “High” disables data transfer. Data input from the point when the CS pin changes from “High” to

“Low” is recognized in 8-bit units.

tDOF F

CS

tCS H

CP

DA

B0 B1 B2 B3 B4 B5 B6 B7

B0 B1 B2 B3 B4 B5 B6 B7

B0 B1 B2 B3 B4 B5 B6 B7

LSB

M SB

1st byte

W he n data is written

to DC RAM *

Command and address data

LS B

M SB

2nd byte

Ch ar ac te r c ode d ata

LSB

M SB

3rd byte

Cha rac ter co de da ta o f th e

nex t add re ss

Note:

When data is written to RAM (DCRAM, ADRAM, CGRAM) continuously, addresses are internally incremented automatically. Therefore it is not

necessary to specify the 1st byte to write RAM data for the 2nd and later bytes.

RESET FUNCTION

Reset is executed when the RESET pin is set to “L”, (when turning power on, for example) and initializes all functions.

Initial status is as follows.

Address of each RAM.......................address “00”H

Data of each RAM.............................All contents are undefined

Display digit ......................................20 digits

Brightness adjustment ......................0/1024

All display lights ON or OFF..............OFF mode

Segment output.................................All segment outputs go “Low”

AD output..........................................All AD outputs go “Low”

Be sure to execute the reset operation when turning power on and set again according to “Setting Flowchart” after reset.

V1.2

8

March 2012

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