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HT1621 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

Part No. HT1621
Description  RAM Mapping 324 LCD Controller for I/O MCU
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Maker  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
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HT1621 Datasheet(HTML) 13 Page - Holtek Semiconductor Inc

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Application Circuits
Host Controller with an HT1621 Display System
Note:
The connection of IRQ and RD pin can be selected depending on the requirement of the MCU.
The voltage applied to VLCD pin must be equal to or lower than VDD.
Adjust VR to fit LCD display, at VDD=5V, VLCD=4V, VR=15k
W±20%.
Adjust R (external pull-high resistance) to fit user
¢s time base clock.
In order to obtain the correct 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)
Crystal Error
Capacity Value
±10ppm
0~10p
10~20ppm
10~20p
Command Summary
HT1621/HT1621G
Rev. 2.90
13
November 9, 2010
PATENTED
I R Q
D A T A
*
O n - c h i p O S C
O S C I
O S C O
C l o c k O u t
E x t e r n a l C o l c k 1
E x t e r n a l C o l c k 2
C S
R D
W R
C r y s t a l
3 2 7 6 8 H z
H T 1 6 2 1 B
L C D P a n e l
B Z
B Z
C O M 0 ~ C O M 3
S E G 0 ~ S E G 3 1
P i e z o
1 / 2 o r 1 / 3 B i a s ; 1 / 2 , 1 / 3 o r 1 / 4 D u t y
R
*
V R
*
V D D
V L C D
M C U
C 1
C 2
Name
ID
Command Code
D/C
Function
Def.
READ
110
A5A4A3A2A1A0D0D1D2D3
D
Read data from the RAM
WRITE
101
A5A4A3A2A1A0D0D1D2D3
D
Write data to the RAM
READ-MODIFY-
WRITE
101
A5A4A3A2A1A0D0D1D2D3
D
READ and WRITE to the RAM
SYS DIS
100
0000-0000-X
C
Turn off both system oscillator and LCD
bias generator
Yes
SYS EN
100
0000-0001-X
C
Turn on system oscillator
LCD OFF
100
0000-0010-X
C
Turn off LCD bias generator
Yes
LCD ON
100
0000-0011-X
C
Turn on LCD bias generator
TIMER DIS
100
0000-0100-X
C
Disable time base output
WDT DIS
100
0000-0101-X
C
Disable WDT time-out flag output
TIMER EN
100
0000-0110-X
C
Enable time base output
WDT EN
100
0000-0111-X
C
Enable WDT time-out flag output


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