KS0070 データシートの表示（PDF） - Samsung

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KS0070

16COM / 80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD

Samsung 

KS0070B

16COM / 80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD

FUNCTION DESCRIPTION

System Interface

This chip has both kinds of interface type with MPU: 4-bit bus and 8-bit bus.

4-bit bus and 8-bit bus are selected by the DL bit in the instruction register.

During read or write operation, two 8-bit registers are used. One is the data register (DR), and the other is the

instruction register (IR).

The data register (DR) is used as a temporary data storage place for being written into or read from DDRAM/

CGRAM. Target RAM is selected by RAM address setting instruction. Each internal operation, reading from or writ-

ing into RAM, is done automatically.

After MPU reads DR data, the data in the next DDRAM/CGRAM address is transferred into DR automatically.

Also, after MPU writes data to DR, the data in DR is transferred into DDRAM/CGRAM

automatically.

The Instruction register (IR) is used only to store instruction codes transferred from MPU. MPU cannot use it to

read instruction data.

To select a register, use RS input pin in 4-bit/8-bit bus mode.

Table 1. Various Kinds of Operations According to RS and R/W bits.

RS

R/W

Operation

0

0

Instruction Write operation (MPU writes Instruction code into IR)

0

1

Read Busy flag (DB7) and address counter (DB0 ~ DB6)

1

0

Data Write operation (MPU writes data into DR)

1

1

Data Read operation (MPU reads data from DR)

Busy Flag (BF)

When BF = "1", it indicates that the internal operation is being processed. So during this time the next instruction

cannot be accepted. BF can be read, when RS = "0" and R/W = "1"

(Read Instruction Operation), through DB7 port.

Before executing the next instruction, be sure that BF is not "1".

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