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HT16C21 Datasheet(PDF) 19 Page - Holtek Semiconductor Inc

Part # HT16C21
Description  RAM Mapping 20*4 / 16*8 LCD Driver Controller
PDF  34 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT16C21 Datasheet(HTML) 19 Page - Holtek Semiconductor Inc

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Rev. 1.00
19
November 22, 2011
HT16C21
Command Summary
Display Data Input Command
This command sends data from MCU to memory MAP of the HT16C21 device.
Function
Byte (MSB)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1 (LSB)
Bit0
Note
R/W Def
Display data input/
output command
1st
1
0
0
0
0
0
0
0
W
Address pointer
2nd
X
X
X
X
A3
A2
A1
A0
Display data
start address
of memory
map
W
00H
Note:
● Power on status: The address is set to 00H.
● If the programmed command is not defined, the function will not be affected.
● For 1/4 duty drive mode after reaching the memory location 09H, the pointer will reset to 00H.
● For 1/8 duty drive mode after reaching the memory location 0FH, the pointer will reset to 00H.
Drive Mode Command
Function
Byte (MSB)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1 (LSB)
Bit0
Note
R/W Def
Driver mode setting
command
1st
1
0
0
0
0
0
1
0
W
Duty and bias setting
2nd
X
X
X
X
X
X
Duty Bias
W
00H
Note:
Bit
Duty
Bias
Duty
Bias
0
0
1/4duty
1/3bias
0
1
1/4duty
1/4bias
1
0
1/8duty
1/3bias
1
1
1/8duty
1/4bias
● Power on status: The drive mode 1/4 duty output and 1/3 bias is selected.
● If the programmed command is not defined, the function will not be affected.
System Mode Command
Function
Byte (MSB)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1 (LSB)
Bit0
Note
R/W Def
System mode setting
command
1st
1
0
0
0
0
1
0
0
W
System oscillator and
display on/off setting
2nd
X
X
X
X
X
X
S
E
W
00H
Note:
Bit
Internal System Oscillator
LCD Display
S
E
0
X
off
off
1
0
on
off
1
1
on
on
● Power on status: Display off and disable the internal system oscillator.
● If the programmed command is not defined, the function will not be affected.



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