Name

Command Code

D/C

Function

Def.

TONE 2K

X100-0001-0001-XXXX-XXXX

C

Turn on tone output, tone frequency output:

2kHz

IRQ DIS

X100-0001-0010-XXXX-XXXX

C

Disable IRQ output

Yes

IRQ EN

X100-0001-0011-XXXX-XXXX

C

Enable IRQ output

RC 32K

X100-0001-0100-XXXX-XXXX

C

System clock source, on-chip RC oscillator

Yes

EXT (X

¢TAL)

X100-0001-0101-XXXX-XXXX

C

System clock source, external 32kHz clock

source or crystal oscillator 32.768kHz

LARGE BIAS

X100-0001-0110-XXXX-XXXX

C

Large bias current option

Yes

MIDDLE BIAS

X100-0001-0111-XXXX-XXXX

C

Middle bias current option

SMALL BIAS

X100-0001-1000-XXXX-XXXX

C

Small bias current option

BIAS 1/6

X100-0001-1010-XXXX-XXXX

C

LCD 1/6 bias option

Yes

BIAS 1/5

X100-0001-1001-XXXX-XXXX

C

LCD 1/5 bias option

FRAME 170Hz

X100-0001-1100-XXXX-XXXX

C

Selects 170Hz frame frequency

FRAME 89Hz

X100-0001-1101-XXXX-XXXX

C

Selects 89Hz frame frequency

FRAME 64Hz

X100-0001-1110-XXXX-XXXX

C

Selects 64Hz frame frequency

Yes

Select 112

´16

X100-0001-1111-XXXX-XXXX

C

This command will change segment from 96

to 112 and command from 32 to 16

F1

X100-1010-0000-XXXX-XXXX

C

Time base clock output: 1Hz

The WDT time-out flag after: 4s

F2

X100-1010-0001-XXXX-XXXX

C

Time base clock output: 2Hz

The WDT time-out flag after: 2s

F4

X100-1010-0010-XXXX-XXXX

C

Time base clock output: 4Hz

The WDT time-out flag after: 1s

F8

X100-1010-0011-XXXX-XXXX

C

Time base clock output: 8Hz

The WDT time-out flag after: 1/2s

F16

X100-1010-0100-XXXX-XXXX

C

Time base clock output: 16Hz

The WDT time-out flag after: 1/4s

F32

X100-1010-0101-XXXX-XXXX

C

Time base clock output: 32Hz

The WDT time-out flag after: 1/8s

F64

X100-1010-0110-XXXX-XXXX

C

Time base clock output: 96Hz

The time-out flag after: 1/16s

F128

X100-1010-0111-XXXX-XXXX

C

Time base clock output: 128Hz

The WDT time-out flag after: 1/32s

Yes

TEST

X100-1111-1111-XXXX-XXXX

C

Test mode, user don

¢t use.

NORMAL

X100-1111-1110-XXXX-XXXX

C

Normal mode, 96

´32 mode will be set

Yes

Note:

²X² stands for don¢t care

A9~A0: RAM address

D3~D0: RAM data

D/C: Data/Command mode

Def.: Power-on reset default

All the bold forms, namely 11 0, 10 1, and 10 0, are mode commands. Of these, 10 0 indicates the command

mode ID. If successive commands have been issued, the command mode ID except for the first command will

be omitted. The tone frequency source and the time base/WDT clock frequency source can be derived from an

on-chip 32kHz RC oscillator, a 32.768kHz crystal oscillator, or an external 32kHz clock. Calculation of the fre-

quency is based on the system frequency sources as stated above. It is recommended that the host controller

should initialize the HT1660 after power-on reset, otherwise, power on reset may fail, which in turn leads to the

malfunctioning of the HT1660.

HT1660

Rev. 1.00

16

September 16, 2003