HT1621 datasheet(18/20 Pages) HOLTEK

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Command Summary

HT1621

April 21, 2000

Name

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

TONE OFF 100 0000-1000-X

C Turn off tone outputs

Yes

TONE ON

100 0000-1001-X

C Turn on tone outputs

CLR TIMER 100 0000-11XX-X

C Clear the contents of time base

generator

CLR WDT

100 0000-111X-X

C Clear the contents of WDT stage

XTAL 32K

100 0001-01XX-X

C System clock source, crystal

oscillator

RC 256K

100 0001-10XX-X

C System clock source, on-chip RC

oscillator

Yes

EXT 256K

100 0001-11XX-X

C System clock source, external

clock source

BIAS 1/2

100 0010-abX0-X

LCD 1/2 bias option

ab=00: 2 commons option

ab=01: 3 commons option

ab=10: 4 commons option

BIAS 1/3

100 0010-abX1-X

LCD 1/3 bias option

ab=00: 2 commons option

ab=01: 3 commons option

ab=10: 4 commons option

TONE 4K

100 010X-XXXX-X

C Tone frequency, 4kHz

TONE 2K

100 011X-XXXX-X

C Tone frequency, 2kHz

IRQ DIS

100 100X-0XXX-X

C Disable IRQ output

Yes

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