7
Character RAM
CGRAM allows the creation of up to
eight 5x8 character patterns. Eight
bytes are assigned to each character
address, the least significant five bits of
which represent the five pixel columns.
Pixels are activated by setting the bit in
their position in CGRAM to “1”.
Each character has eight addresses in
CGRAM corresponding to each of its
eight pixel rows. The highest three bits
represent the character address in
DDRAM. The lowest three bits of this
address represent the row positions
beginning with 0 at the top. The last
row will be logically OR’d with the
cursor when it is active.
Finally, each character can be
referenced in DDRAM and written to
the screen using its eight bit address.
Table 8:Relationship between CGRAM Addresses,
Character Codes (DDRAM
Data) and Character Patterns (CGRAM Data)
Note: *
Indicates no effect.
Timing Characteristics
Table 9: Read and Write Operation Specifications
Write
Read
Item
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
Enable cycle time
tcycE
1200
－
－
1200
－
－
ns
Enable pulse width (high level)
PWEH
140
－
－
140
－
－
ns
Enable rise/fall time
tEr,tEf
－
－
25
－
－
25
ns
Address set-up time (RS, R/W to E)
tAS
0
－
－
0
－
－
ns
Address hold time
tAH
10
－
－
10
－
－
ns
Data set-up time
tDS
40
－
－
－
－
100
ns
Data hold time
tH
10
－
－
10
－
－
ns
Conditions:
Ta=25℃, VDD=5.0± 0.5V
Figure 3: Write Timing Waveform
Figure 4: Read
Timing Waveform
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MOP-AL204A-BYFY-25E-3IN
DISPLAY LCD 20X4
MOP-GL240128D-BYFY
LCD GRAPHIC DISPL 240X128 Y/G BK
MOP-GL24064A-BYFY
LCD MODULE GRAPH 240X64 LED/CTRL
MPF102G
AMP JFET UHF N-CHAN 25V TO-92
MPLEZW-A1-0000-0000E040H
LED EASYWHITE XLAMP 4000K SMD
MPN3404G
DIODE PIN VHF/SW 20V TO92-2
MRF1511NT1
MOSFET RF N-CH PLD-1.5
MRF1513NT1
MOSFET RF N-CH PLD-1.5
相关代理商/技术参数
MOP-AL204A-BBTR-25E-3IN
功能描述:LCD字符显示模块与配件 20x4 Red Txt Blk B/G Parallel LCD
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk
MOP-AL204A-BBTW-25E-3IN
功能描述:LCD字符显示模块与配件 20x4 Wht Txt Blu B/G Parallel LCD
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk
MOP-AL204A-BGFW-25E-3IN
功能描述:LCD字符显示模块与配件 20x4 Light Blue Txt Gry/Wht B/G
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk
MOP-AL204A-BTTY-25E-3IN
功能描述:LCD字符显示模块与配件 20x4 Ylw Txt Blk B/G Parallel LCD
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk
MOP-AL204A-BYFY-25E-3IN
功能描述:LCD字符显示模块与配件 20x4 Blk Txt Y/Gr B/G
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk
MOP-AL204B-BYFY-25E-3IN
功能描述:LCD字符显示模块与配件 20x4 Blk Txt Y/Gr B/G
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk
MOP-AL242A-BYFY-25E-3IN
功能描述:LCD字符显示模块与配件 20x4 Blk Txt Y/Gr B/G
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk
MOP-AL402A-BYFY-25E-3IN
功能描述:LCD字符显示模块与配件 40x2 Blk Txt Y/Gr B/G
RoHS:否 制造商:Lumex 显示模式:Transflective 字符计数 x 行:16 x 2 特点: 流体类型:STN 接口: 背景色: 工作温度范围:- 20 C to + 70 C 封装:Bulk