Application Circuits

Note:

The connection of IRQ and RD pin can be selected depending on the requirement of the MCU.

W±20%.

Adjust R (external pull-high resistance) to fit user

¢s time base clock.

Instruction Set Summary

Name

ID

Command Code

D/C

Function

Def.

READ

110 A7A6A5A4A3A2A1A0D0D1D2D3

D

Read data from the RAM

WRITE

101 A7A6A5A4A3A2A1A0D0D1D2D3

D

Write data to the RAM

READ-MODIFY-

WRITE

101 A7A6A5A4A3A2A1A0D0D1D2D3

D

Read and Write data 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 display

Yes

LCD ON

100 0000-0011-X

C

Turn on LCD display

TIMER DIS

100 0000-0100-X

C

Disable time base output

Yes

WDT DIS

100 0000-0101-X

C

Disable WDT time-out flag output

Yes

TIMER EN

100 0000-0110-X

C

Enable time base output

WDT EN

100 0000-0111-X

C

Enable WDT time-out flag output

TONE OFF

100 0000-1000-X

C

Turn off tone outputs

Yes

CLR TIMER

100 0000-1101-X

C

Clear the contents of the time base

generator

CLR WDT

100 0000-1111-X

C

Clear the contents of the WDT stage

RC 32K

100 0001-10XX-X

C

System clock source, on-chip RC

oscillator

Yes

HT1626

Rev. 1.60

12

November 9, 2010

PATENTED

B Z

I R Q

H T 1 6 2 6

D A T A

1 / 5 B i a s , 1 / 1 6 D u t y

C S

R D

W R

L C D P a n e l

C O M 0 ~ C O M 1 5

S E G 0 ~ S E G 4 7

B Z

*

O n - c h i p O S C

C l o c k O u t

E x t e r n a l C l o c k 1 ( 3 2 k H z )

E x t e r n a l C l o c k 2 ( 3 2 k H z )

C r y s t a l

3 2 7 6 8 H z

R*

O S C I

O S C O

V R

*

V D D

V L C D

P i e z o

M C U