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HT1621B-48SSOP 参数 Datasheet PDF下载

HT1621B-48SSOP图片预览
型号: HT1621B-48SSOP
PDF下载: 下载PDF文件 查看货源
内容描述: LCD显示驱动| 32 - SEG | 4 - BP | CMOS | SSOP | 48PIN |塑料\n [LCD DISPLAY DRIVER|32-SEG|4-BP|CMOS|SSOP|48PIN|PLASTIC ]
分类和应用: 驱动
文件页数/大小: 20 页 / 187 K
品牌: ETC [ ETC ]
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HT1621  
OFF command turns the LCD display off by dis-  
abling the LCD bias generator. The LCD ON  
command, on the other hand, turns the LCD  
display on by enabling the LCD bias generator.  
The BIAS and COM are the LCD panel related  
commands. Using the LCD related commands,  
the HT1621 can be compatible with most types  
of LCD panels.  
the system is operating in the non-successive  
command or the non-successive address data  
mode, the CS pin should be set to "1" and the  
previous operation mode will be reset also.  
Once the CS pin returns to "0" a new operation  
mode ID should be issued first.  
Interfacing  
Only four lines are required to interface with  
the HT1621. The CS line is used to initialize the  
serial interface circuit and to terminate the com-  
munication between the host controller and the  
HT1621. If the CS pin is set to 1, the data and  
command issued between the host controller and  
the HT1621 are first disabled and then initial-  
ized. Before issuing a mode command or mode  
switching, a high level pulse is required to initial-  
ize the serial interface of the HT1621. The DATA  
line is the serial data input/output line. Data to  
be read or written or commands to be written  
have to be passed through the DATA line. The RD  
line is the READ clock input. Data in the RAM  
are clocked out on the falling edge of the RD sig-  
nal, and the clocked out data will then appear on  
the DATA line. It is recommended that the host  
controller read in correct data during the interval  
between the rising edge and the next falling edge  
of the RD signal. The WR line is the WRITE clock  
input. The data, address, and command on the  
DATA line are all clocked into the HT1621 on the  
rising edge of the WR signal. There is an optional  
IRQ line to be used as an interface between the  
host controller and the HT1621. The IRQ pin can  
be selected as a timer output or a WDT overflow  
flag output by the S/W setting. The host control-  
ler can perform the time base or the WDT func-  
tion by being connected with the IRQ pin of the  
HT1621.  
Command format  
The HT1621 can be configured by the S/W set-  
ting. There are two mode commands to configure  
the HT1621 resources and to transfer the LCD  
display data. The configuration mode of the  
HT1621 is called command mode, and its com-  
mand mode ID is 1 0 0. The command mode con-  
sists of a system configuration command, a  
system frequency selection command, a LCD con-  
figuration command, a tone frequency selection  
command, a timer/WDT setting command, and  
an operating command. The data mode, on the  
other hand, includes READ, WRITE, and  
READ-MODIFY-WRITE operations. The follow-  
ing are the data mode IDs and the command  
mode ID:  
Operation  
Mode  
Data  
Data  
Data  
ID  
READ  
1 1 0  
1 0 1  
1 0 1  
WRITE  
READ-MODIFY-WRITE  
COMMAND  
Command 1 0 0  
The mode command should be issued before the  
data or command is transferred. If successive  
commands have been issued, the command  
mode ID, namely 1 0 0, can be omitted. While  
12  
January 10, 2001  
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