PATENTED
Application Circuits
HT1626
*
M C U
*R
C S
R D
W R
D A T A
V D D
*V R
V L C D
H T 1 6 2 6
B Z
P ie z o
B Z
IR Q
O S C I
C lo c k O u t
E x te r n a l C lo c k 1 ( 3 2 k H z )
E x te r n a l C lo c k 2 ( 3 2 k H z )
O n - c h ip O S C
1 /5 B ia s , 1 /1 6 D u ty
O S C O
C O M 0 ~ C O M 1 5
S E G 0 ~ S E G 4 7
L C D
C ry s ta l
3 2 7 6 8 H z
P a n e l
Note:
The connection of IRQ and RD pin can be selected depending on the requirement of the MCU.
The volatage applied to V
LCD
pin must be equal to or lower than V
DD
.
Adjust VR to fit LCD display, at V
DD
=5V, V
LCD
=4V, VR=15kW±20%.
Adjust R (external pull-high resistance) to fit user¢s time base clock.
Instruction Set Summary
Name
READ
WRITE
ID
Command Code
D/C
D
D
D
C
C
C
C
C
C
C
C
C
C
C
C
Function
Read data from the RAM
Write data to the RAM
Read and Write data to the RAM
Turn off both system oscillator and LCD
Yes
bias generator
Turn on system oscillator
Turn off LCD display
Turn on LCD display
Disable time base output
Disable WDT time-out flag output
Enable time base output
Enable WDT time-out flag output
Turn off tone outputs
Clear the contents of the time base
generator
Clear the contents of the WDT stage
System clock source, on-chip RC
oscillator
Yes
Yes
Yes
Yes
Yes
Def.
1 1 0
A7A6A5A4A3A2A1A0D0D1D2D3
1 0 1
A7A6A5A4A3A2A1A0D0D1D2D3
READ-MODIFY-
1 0 1
A7A6A5A4A3A2A1A0D0D1D2D3
WRITE
SYS DIS
SYS EN
LCD OFF
LCD ON
TIMER DIS
WDT DIS
TIMER EN
WDT EN
TONE OFF
CLR TIMER
CLR WDT
RC 32K
1 0 0
0000-0000-X
1 0 0
0000-0001-X
1 0 0
0000-0010-X
1 0 0
0000-0011-X
1 0 0
0000-0100-X
1 0 0
0000-0101-X
1 0 0
0000-0110-X
1 0 0
0000-0111-X
1 0 0
0000-1000-X
1 0 0
0000-1101-X
1 0 0
0000-1111-X
1 0 0
0001-10XX-X
Rev. 1.60
12
November 9, 2010
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
