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HT1621_10 参数 Datasheet PDF下载

HT1621_10图片预览
型号: HT1621_10
PDF下载: 下载PDF文件 查看货源
内容描述: 内存映射32×4 LCD控制器的I / O MCU [RAM Mapping 324 LCD Controller for I/O MCU]
分类和应用: 控制器
文件页数/大小: 21 页 / 195 K
品牌: HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
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PATENTED  
HT1621/HT1621G  
mands. Using the LCD related commands, the HT1621  
can be compatible with most types of LCD panels.  
level pulse is required to initialize 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 signal, 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 be-  
tween 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 controller can perform the  
time base or the WDT function by being connected with  
the IRQ pin of the HT1621.  
Command Format  
The HT1621 can be configured by the S/W setting. There  
are two mode commands to configure the HT1621 re-  
sources and to transfer the LCD display data. The configu-  
ration mode of the HT1621 is called command mode, and  
its command mode ID is 1 0 0. The command mode con-  
sists of a system configuration command, a system  
frequency selection command, a LCD configuration com-  
mand, 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 following are the  
data mode IDs and the command mode ID:  
Operation  
Mode  
Data  
ID  
Read  
Write  
1 1 0  
1 0 1  
1 0 1  
1 0 0  
Crystal Selection  
Data  
A 32768Hz crystal can be directly connected to the  
HT1621 via OSCI and OSCO. In order to obtain the cor-  
rect frequency, two additional load capacities (C1, C2)  
are needed. The value of the capacity depends on how  
accurate the crystal is. We suggest that you can follow  
the table, which suggests the value of capacities. The  
table illustrates the suggestion value of capacities (C1,  
C2).  
Read-Modify-Write  
Command  
Data  
Command  
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 the system is operating in the  
non-successive command or the non-successive ad-  
dress data mode, the CS pin should be set to ²1² and the  
previous operation mode will be reset also. Once the CS  
pin returns to ²0² a new operation mode ID should be is-  
sued first.  
3
2
7
6
8
H
z
O
S
C
I
O
S
C
O
C
1
C
2
Interfacing  
Crystal Error  
±10ppm  
Capacity Value  
0~10p  
Only four lines are required to interface with the  
HT1621. The CS line is used to initialize the serial inter-  
face circuit and to terminate the communication 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 initialized. Be-  
fore issuing a mode command or mode switching, a high  
10~20ppm  
10~20p  
Timing Diagrams  
READ Mode (Command Code : 1 1 0)  
C
W
R
D
S
R
D
A
0
A
5
A
3
A
2
D
2
D
3
0
A
5
A
3
A
2
D
2
D
1
3
A
4
A
1
A
0
D
0
D
1
A
4
A
1
A
0
D
0
D
1
1
1
1
T
A
M
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m
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y
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Rev. 2.90  
10  
November 9, 2010