HT1650 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT1650' PDF : 18 Pages View PDF
PATENTED
HT1650
Name
Command Code
D/C
Function
Def.
F8
X100-1010-0011-XXXX
C
Time base clock output: 8Hz
The WDT time-out flag after 1/2s
F16
X100-1010-0100-XXXX
C
Time base clock output: 16Hz
The WDT time-out flag after 1/4s
F32
X100-1010-0101-XXXX
C
Time base clock output: 32Hz
The WDT time-out flag after 1/8s
F64
X100-1010-0110-XXXX
C
Time base clock output: 64Hz
The WDT time-out flag after 1/16s
F128
X100-1010-0111-XXXX
C
Time base clock output: 128Hz
The WDT time-out flag after 1/32s
Yes
TEST
X100-1111-1111-XXXX
C Test mode, not for use by the user
NORMAL
X100-1111-1110-XXXX
C Normal mode, 64´32 mode will be set
Yes
Note:
²X² stands for don¢t care
A8~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 or 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
frequency is based on the system frequency sources as stated above. It is recommended that the host control-
ler should initialize the HT1650 after power-on reset, otherwise, power on reset may fail, which in turn leads to
the malfunctioning of the HT1650.
Rev. 1.80
16
November 9, 2010
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