HT16L21 Datasheet, PDF (22/36 Pages) Holtek Semiconductor Inc – RAM Mapping 32x4 LCD Driver

HT16L21
• Display RAM Single Data Byte
The display RAM single data write operation consists of a display data input (write) command, a register
address and a write data byte.
CSB
CLK
2μs(min)
2μs(min)
DIO
Display Data Input command byte
10000000
Register Address byte
X X X X A3 A2 A1 A0
Data byte
D7 D6 D5 D4 D3 D2 D1 D0
SPI Display RAM Single Data Byte Write Operation
Display RAM Page Write Operation
The display RAM Page write operation consists of a display data write command, a register address of which the
contents are written to the internal address pointer followed by N bytes of written data. The data to be written to
the memory will be transmitted next and then the internal address pointer will be automatically incremented by
1 to indicate the next memory address location. After the internal address point reaches the maximum memory
address, the address pointer will be reset to 00H.
CSB
CLK
DIO
2μs(min)
2μs(min)
2μs(min)
2μs(min)
Display Data Input Command byte
10000000
Register Address byte
X X X X A3 A2 A1 A0
Data byte
D7 D6 D5 D4 D3 D2 D1 D0
Data byte
D7 D6 D5 D4 D3 D2 D1 D0
Data
byte
D7
1^st data
2^nd data
3^rd data
CSB
CLK
DIO
2μs(min)
Data byte
D0
D7 D6 D5 D4 D3 D2 D1 D0
(N-1)^th
data
N^th data
SPI Interface N Bytes Display RAM Data Write Operation
SP1 SP0
0
X
1
0
1
1
Maximum Memory Address
0FH
0DH
0BH
Rev. 1.00
22
November 16, 2011