MSM6555B 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM6555B

DOT MATRIX LCD CONTROLLER WITH 17-DOT COMMON DRIVER AND 80-DOT SEGMENT DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM6555B-xx

FUNCTIONAL DESCRIPTION

Pin Functional Description

• SI (Serial Input)

This is an input pin used to input the command and display data serially in the 8-bit unit,

where "H" is defined as 1 and "L" is as 0. When the CS pin is at "H" level, command or display

data is read by the rising edge of SHT. Whether the input data is command or display data

is determined by the setting of the C/D at the 8th rising edge of the SHT. The input data is

command when C/D = "H", and is display data when C/D = "L".

• C/D (Command/Data)

This is an input pin used to determine whether the data input into the SI pin is command or

display data. It is read at the 8th rising edge of the SHT. The input data is command when

C/D = "H", and is display data when C/D = "L".

• SHT (Shift Clock)

This is a read clock for SI input and C/D input, which are read at the rising edge of SHT.

Reading completes in 8 clocks. Maintain this SHT pin at "H" when there is no command and

data input from the SI pin. Input during the busy condition will result in operation errors. It

is valid when the CS pin is at "H".

• SO (Serial Out)

This is a busy/non-busy and display data serial read-out pin, where "H" is defined as 1 and

"L" is as 0. It is output when CS = "H" and the Serial Out Enable is set by the command, while

high impedance occurs otherwise.

The busy/non-busy signal is output when CS input is at the "H" level. The "H" represents the

non-busy state while "L" denotes the busy state. The busy state occurs after the 8th rising edge

of the SHT, and the state is automatically shifted to the non-busy state after the lapse of a

specified time.

Furthermore, the display data is output synchronously with the falling edge of the SHT.

• CS (Chip Select)

This is a chip select pin, where "H" represents the Select and "L" the Non-select. "L" input

causes the SO pin to be opened, and the SHT pin corresponds to "H" inside the IC. For the SI,

C/D, SHT, SO and CS, see "I/O Procedure".

• RST (Reset)

Input of "L" level pulse into this pin will suspend the oscillation to prevent the breakthrough

current in the oscillation phase, and the Common and Segment outputs is set to the reset state

where VDD level is output. This reset state can be released only by command input. (See

STOP command.) Furthermore, contrast control will be the minimum in the combination of

N2 and N1.

Setting this pin to "L" level during the command execution will cause operation errors. When

power is turned on, the RST pin must be set to "L". This pin is based on direct input reset

method. Current consumption is 5 to 10 mA during the process of "L" input, so fixed "L" input

must not be set.

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