NJU3430 データシートの表示（PDF） - Japan Radio Corporation

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NJU3430

16-CHARACTER 1-LINE DOT MATRIX VFD CONTROLLER DRIVER16-CHARACTER 1-LINE DOT MATRIX VFD CONTROLLER DRIVER

Japan Radio Corporation  

NJU3430

(h)RAM Address Set

RS B7 B6 B5 B4 B3 B2 B1 B0

1

0

0

0 A D 3 A D 2 A D 1 A D 0 ← DD RAM Addredd Set:(00)H to (0F)H

0

1

0

0

1 A M 3 A M 2 A M 1 A M 0 ← MK RAM Address Set:(00)H to (0F)H

1

1 A C 5 A C 4 A C 3 A C 2 A C 1 A C 0 ← CG RAM Address Set:(00)H to (3F)H

The DD RAM, MK RAM and CG RAM Address are set by RAM Address Set. Correspondences of each RAM

address and Display position are shown below :

Correspondence of DD RAM Address and Timing terminals (Not shift)

DD RAM Address 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

Digits

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Correspondence of MK RAM Address and Timing terminals (Not shift)

MK RAM Address 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

Digits

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

About the detail of CG RAM Address, refer to "(1)CG RAM data and Character Dot Matrix”.

(i)Write Data to RAM

RS B7 B6 B5 B4 B3 B2 B1 B0

S D 7 S D 6 S D 5 S D 4 S D 3 S D 2 S D 1 S D 0 ← DD RAM Data Set:(00)H to (FF)H

1

0

0

0

0

0

0 S M 1 S M 0 ← MK RAM Data Set:(00)H to (03)H

0

0

0 S C 4 S C 3 S C 2 S C 1 S C 0 ← CG RAM Data Set:(00)H to (1F)H

The data are written into DD RAM, MK RAM and CG RAM by Write Data to RAM. The writing data address is

used that is set the address just before writing data. Therefore, when the new data writing, the address set should

be executed before writing data. The address is increased by 1 automatically after writing data, therefore, the MPU

writes the data into the each RAM without any address setting after the start address.

(Writing example)

1Byte

10000011

DD RAM Address

set(03)H

2Byte

3Byte

4Byte

01010101

11111000

00110101

DD RAM Address(03)H DD RAM Address(04)H DD RAM Address(05)H

set CG ROM(55)H

set CG ROM(F8)H set CG ROM(35)H

The writing data in the each RAM are shown below.

DD RAM Data[SD7 to SD0] --- Character code of each digit

: (00)H to (FF)H

MK RAM Data[SM1 to SM0] --- Icon display of each digit

: SM1→MK2, SM0→MK1

CG RAM Data[SC4 to SC0] --- Character code

: (00)H to (0F)H Dot Data

(About the detail, refer to "(1)CG RAM data and Character Dot Matrix”.)

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