Data Sheet S15918EJ1V0DS

4

4. PIN FUNCTIONS

(1/2)

Pin Symbol

Pin Name

I/O

Description

Driver

Output

The D/A converted 256-gray-scale analog voltage is output.

Port 1 display data

Input

The display data is input with a width of 48 bits, viz., the gray scale data

(8 bits) by 6 dots (2 pixels).

Port 2 display data

Input

R,/L

Shift direction control

Input

The shift direction control pin of shift register. The shift directions of the

shift registers are as follows.

R,/L = H (right shift): STHR input

R,/L = L (left shift) : STHL input

STHR

Right shift start pulse

I/O

STHL

Left shift start pulse

I/O

These are the start pulse input/output pins when connected in cascade.

Loading of display data starts when a high level is read at the rising

edge of CLK.

At the rising edge of the 64th clock after the start pulse input, the start

pulse output reaches the high level, thus becoming the start pulse of

the next-level driver.

For right shift, STHR is input and STHL is output.

For left shift, STHL is input and STHR is output.

CLK

Shift clock

Input

The shift clock input pin of shift register. The display data is loaded into

the data register at the rising edge.

When 66 clock pulses are input after input of the start pulse, input of

display data is halted automatically. The contents of the shift register

are cleared at the STB’s rising edge.

STB

Latch

Input

The contents of the data register are transferred to the latch circuit at

the rising edge. In addition, at the falling edge, the gray scale voltage is

supplied to the driver. It is necessary to ensure input of one pulse per

horizontal period.

SRC

Slew-rate control

Input

SRC = H: High-slew-rate mode (large current consumption)

SRC = L: Low-slew-rate mode (small current consumption)

ORC

Output resistance control

Input

ORC = H: Low output resistance mode

ORC = L: High output resistance mode

POL

Polarity

Input

STB’s rising edge.

When it switches such as POL = H

→L or L→H, all output pins are

output reset during STB = H. When it does not switch, all output pins

become Hi-Z (High impedance) during STB = H.

Refer to 7. RELATIONSHIP BETWEEN MODE, STB, SRC, ORC, POL

AND OUTPUT WAVEFORM for details.