HT16512 Просмотр технического описания (PDF) - Holtek Semiconductor
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HT16512 Datasheet PDF : 11 Pages
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HT16512
The data of each key is stored as illustrated below, and
is read with the read command, starting from the least
significant bit.
K 0~K 3
S 0 /K 0
S 2 /K 2
S 4 /K 4
K 0~K 3
S 1 /K 1
S 3 /K 3
S 5 /K 5
R e a d in g fir s t
R e a d in g la s t
b0 b1 b2 b3 b4 b5 b6 b7
LED Port
The LED port belongs to the CMOS output configura-
tion.
Data is written to the LED port with the write command,
starting from the least port¢s least significant bit. In our
application (see application circuits), the user adopts an
internal NMOS device to a driver LED component by
connecting VDD. When a bit of this port is 0, the corre-
sponding LED lights; when the bit is 1, the LED turns off.
The data of bits 5 through 8 are ignored.
M SB
LS B
b3 b2 b1 b0
LE D 0
D o n 't c a r e
LE D 1
LE D 2
LE D 3
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.
M SB
00
LS B
0 0 b3 b2 b1 b0
SW 0
SW 1
SW 2
SW 3
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 initialized, and the com-
mands/data being transmitted are not valid (however,
the commands/data previously transmitted remains
valid).
· Display mode setting commands
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 selected, nothing
happens.
M SB
LS B
00
b2 b1 b0
D o n 't c a r e
D is p la y m o d e s e ttin g s
0 0 0 : 4 d ig its , 1 6 s e g m e n ts
0 0 1 : 5 d ig its , 1 6 s e g m e n ts
0 1 0 : 6 d ig its , 1 6 s e g m e n ts
0 1 1 : 7 d ig its , 1 5 s e g m e n ts
1 0 0 : 8 d ig its , 1 4 s e g m e n ts
1 0 1 : 9 d ig its , 1 3 s e g m e n ts
1 1 0 : 1 0 d ig its , 1 2 s e g m e n ts
1 1 1 : 1 1 d ig its , 1 1 s e g m e n ts
· Data setting commands
These commands set the data write and data read
modes.
M SB
01
LS B
b3 b2 b1 b0
D o n 't c a r e
D a ta w r ite a n d r e a d m o d e s e ttin g s
0 0 : W r ite d a ta to d is p la y m e m o r y
0 1 : W r ite d a ta to L E D p o r t
1 0 : R e a d k e y d a ta
1 1 : R e a d S W d a ta
A d d r e s s in c r e m e n t m o d e s e ttin g s ( d is p la y m e m o r y )
0 : In c r e m e n ts a d d r e s s a fte r d a ta h a s b e e n w r itte n
1 : F ix e s a d d r e s s
T e s t m o d e s e ttin g s
0 : N o rm a l m o d e
1 : T e s t m o d e , u s e r d o n 't u s e
· Address setting commands
These commands set the address of the display mem-
ory.
M SB
11
LS B
b4 b3 b2 b1 b0
D o n 't c a r e
A d d re s s (0 0 H ~ 1 5 H )
If address 16H or higher is set, data is ignored until a
valid address is set.
· Display control commands
M SB
LS B
10
b3 b2 b1 b0
D o n 't c a r e
D im m in g q u a n tity s e ttin g s
0 0 0 : S e t p u ls e w id th to 1 /1 6
0 0 1 : S e t p u ls e w id th to 2 /1 6
0 1 0 : S e t p u ls e w id th to 4 /1 6
0 1 1 : S e t p u ls e w id th to 1 0 /1 6
1 0 0 : S e t p u ls e w id th to 1 1 /1 6
1 0 1 : S e t p u ls e w id th to 1 2 /1 6
1 1 0 : S e t p u ls e w id th to 1 3 /1 6
1 1 1 : S e t p u ls e w id th to 1 4 /1 6
T u r n s o n /o ff d is p la y
0 : D is p la y o ff ( k e y s c a n c o n tin u e s )
1 : D is p la y o n
Rev. 1.50
5
May 7, 2010
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