MSC7128 Datasheet, PDF(12/27 Page) OKI electronic componets – 5 x 7-Dot Character x 16-Digit Display Controller/Driver

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MSC7128 Datasheet, PDF (12/27 Pages) OKI electronic componets – 5 x 7-Dot Character x 16-Digit Display Controller/Driver

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Â¡ Semiconductor

MSC7128-xx

FUNCTIONAL DESCRIPTION

Data Transfer Method and Command Write Method

A display control command or data is written by the 8-bit serial transfer method. The figure

below shows the write timing. When the CS pin is Low, data can be transferred. Data of 8 bits

in length is input to the DA pin sequentially starting with the LSB. (LSB first)

Data is shifted at the rising edge of a shift clock pulse which is input to the CP pin as shown in

the figure below. When 8-bit data is entered, an inner LOAD signal is automatically generated,

and data is written into the registers and RAM. Therefore, there is no need to input an external

LOAD signal.

If the CS pin is changed from Low to High, the serial transfer is inhibited, and data, which is

entered after the CS pin is changed from High to Low, is recognized in units of 8 bits.

The first 8 bits become the first byte, and the second 8 bits become the second byte and the next

8 bits become either the first byte or the second byte depending on the selected command.

tDOFF*1

tCSH*2

b0 b1 b2 b3 b4 b5 b6 b7

LSB

First Byte

MSB LSB

Second Byte MSB

*1 tDOFF : Refer to Data LSB/MSB Timing.

*2 tCSH : Refer to AC Characteristics and Data Timing.

Command Type

First Byte

Second Byte

No.

Command

b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0

0 Address Set

1 0 0 0 X X X X X X X X X3 X2 X1 X0

1 Character Code Set

1 0 0 1 X X X X CU CH6 CH5 CH4 CH3 CH2 CH1 CH0

2 Display Duty Set

1 0 1 0 X X X X X X X X DC3 DC2 DC1 DC0

3 Number of Display Digits Set 1 0 1 1 X X X X X X X X DG3 DG2 DG1 DG0

4 Lamp Test

1 1 0 0 X X X X X X X X X X X LT

*1 When character codes are to be continuously transferred, addresses are automatically

incremented (internally). Accordingly, neither the Address Set command nor the first byte

of the Character Code Set command are required to set the second and the following character

codes.

*2 X : Donât care

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