SC16313

HANGZHOU MICROELECTRONICS CO.,LTD

REV:1.2

2003.08.28

Http: www.silan.com.cn

Page 6 of 10

Command 4: display control command

This command is used to turn ON or OFF a display. It also used to set the pulse width. Please refer to the

diagram below.

ON power application, the 1/16 pulse width is set and the display is turned OFF (the key scanning starts).

1

-

- b3b2b1b0

0

Diming quantity settings:

000: pulse width = 1/16

001: pulse width = 2/16

010: pulse width = 4/16

011: pulse width = 10/16

100: pulse width = 11/16

101: pulse width = 12/16

110: pulse width = 13/16

111: pulse width = 14/16

Turns on / off display:

0: display OFF

1: display ON

Don't

care

MSB

LSB

KEY SCANNING AND DISPLAY TIMING

The key scanning and display timing diagram is given below. One cycle of key scanning consists of 2 frames.

In the first frame, those keys connected to KS1~KS4 are scanned, while the second frame scans KS5~KS8. The

data of the 8 x 2 matrix is stored in the key-input RAM.