Serial Data Input Timing

Pin Functions

No. 4248-3/11

LC74770M

No.

Symbol

Pin

Function

1

Ground pin

Ground connection

2

LC oscillator pin

Connections for the coil and capacitor that form the oscillator that generates the character output

3

dot clock.

4

Clock output/test

output pin

5

P0

General-purpose port 0

General-purpose port (PORT0) output

output pin

6

P1

General-purpose port 1

General-purpose port (PORT1) output

output pin

7

CS

Enable input pin

Enable input for the serial data input function. Serial data input is enabled when this pin is low.

A pull-up resistor is built in, i.e., this is a hysteresis input.

8

SCLK

Clock input pin

Clock input for the serial data input function. A pull-up resistor is built in,

i.e., this is a hysteresis input.

9

SIN

Data input pin

Serial data input. A pull-up resistor is built in, i.e., this is a hysteresis input.

10

Ground pin

Ground connection

11

NC

No connection

12

NC

No connection

Unused pins.

13

NC

No connection

These pins must be left open or connected to ground.

14

NC

No connection

15

CHA1

Character 1 output pin

System 1 character data output

16

BLK1

Blank 1 output pin

System 1 blank data output

17

CHA2

Character 2 output pin

System 2 character data output

18

BLK2

Blank 2 output pin

System 2 blank data output

19

P3

General-purpose port 3

General-purpose port (PORT3) output

output pin

20

P2

General-purpose port 2

General-purpose port (PORT2) output

output pin

21

VSYNC

Vertical synchronizing

Input for the vertical synchronizing signal (active low)

signal input pin

22

HSYNC

Horizontal synchronizing

Input for the horizontal synchronizing signal (active low)

signal input pin

23

RST

Reset input pin

System reset input (active low) A pull-up resistor is built in, i.e., this is a hysteresis input.

24

Power supply pin (+5 V)

Power supply (+5 V)