Command Summary

Name

ID

Command Code

D/C

Function

Def.

READ

110 A6A5A4A3A2A1A0D0D1D2D3 D Read data from the RAM

WRITE

101 A6A5A4A3A2A1A0D0D1D2D3 D Write data to the RAM

READ-

MODIFY-

WRITE

101 A6A5A4A3A2A1A0D0D1D2D3 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

EXT (XTAL)

32K

100 0001-11XX-X

C

System clock source, external

32kHz clock source or crystal

oscillator 32.768kHz

TONE 4K

100 010X-XXXX-X

C Tone frequency output: 4kHz

TONE 2K

100 0110-XXXX-X

C Tone frequency output: 2kHz

IRQ DIS

100 100X-0XXX-X

C Disable IRQ output

Yes

IRQ EN

100 100X-1XXX-X

C Enable IRQ output

F1

100 101X-0000-X

C Time base clock output: 1Hz

The WDT time-out flag after: 4s

F2

100 101X-0001-X

C Time base clock output: 2Hz

The WDT time-out flag after: 2s

F4

100 101X-0010-X

C Time base clock output: 4Hz

The WDT time-out flag after: 1s

HT1623

16

April 21, 2000