HT16512

7

December 24, 1999

SW data

HT16512 provides an extra 4-bit general input port. The SW data is provided with available binary

code. The SW data is read with the read command, starting from the least significant bit. Bits 5

through 8 of the SW data are 0.

Commands

Commands set the display mode and status of the VFD driver.

The first 1 byte input to the HT16512 through the DI pin after the CS pin has fallen, is regarded as a

command. If CS is set high while commands/data are transmitted, serial communication is initial-

ized, and the commands/data being transmitted are not valid (however, the commands/data previ-

ously transmitted remains valid).

These commands initialize the HT16512 and select the number of segments and the number of

grids (1/4~1/11 duty, 11 segments to 16 segments).

When these commands are executed, the display is forcibly turned off, and key scanning is also

stopped. To resume display, the display command ²ON² must be executed. If the same mode is se-

lected, nothing happens.

D i s p l a y m ode s e t t i ngs

000: 4 d i g i t s , 16 s egm ent s

001: 5 d i g i t s , 16 s egm ent s

010: 6 d i g i t s , 16 s egm ent s

011: 7 d i g i t s , 15 s egm ent s

100: 8 d i g i t s , 14 s egm ent s

101: 9 d i g i t s , 13 s egm ent s

110: 10 di gi t s , 12 s e g m ent s

111: 11 di gi t s , 11 s e g m ent s

D on' t c a r e

00

MS B

L S B

b0

b1

b2

SW 0

SW 1

SW 2

SW 3

MS B

L S B

b0

b1

b2

b3

0

0

0

0