HT1660
Name
Command Code
D/C
Function
Def.
Time base clock output: 8Hz
F8
X100-1010-0011-XXXX-XXXX
C
The WDT time-out flag after: 1/2s
Time base clock output: 16Hz
F16
F32
F64
X100-1010-0100-XXXX-XXXX
X100-1010-0101-XXXX-XXXX
X100-1010-0110-XXXX-XXXX
X100-1010-0111-XXXX-XXXX
C
C
C
C
The WDT time-out flag after: 1/4s
Time base clock output: 32Hz
The WDT time-out flag after: 1/8s
Time base clock output: 96Hz
The time-out flag after: 1/16s
Time base clock output: 128Hz
F128
Yes
Yes
The WDT time-out flag after: 1/32s
TEST
X100-1111-1111-XXXX-XXXX
X100-1111-1110-XXXX-XXXX
C
C
Test mode, user don¢t use.
NORMAL
Note:
Normal mode, 96´32 mode will be set
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 1 1 0, 1 0 1, and 1 0 0, are mode commands. Of these, 1 0 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.
Rev. 1.30
17
April 13, 2006
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
