SS1621
p. 15
Last update: 2008-06-03 04:36
Name
ID
Command Code
D/C
Function
Def.
The WDT time-out flag after: 2s
Time base/WDT clock
Output: 4Hz
F4
10 0 101X-X010-X
C
The WDT time-out flag after: 1s
Time base/WDT clock
Output: 8Hz
F8
10 0 101X-X011-X
C
The WDT time-out flag after: 1/2s
Time base/WDT clock
Output: 16Hz
F16
10 0 101X-X100-X
C
The WDT time-out flag after: 1/4s
Time base/WDT clock
Output: 32Hz
F32
10 0 101X-X101-X
C
The WDT time-out flag after: 1/8s
Time base/WDT clock
Output: 64Hz
F64
10 0 101X-X110-X
C
The WDT time-out flag after: 1/16s
Time base/WDT clock
Output: 128Hz
F128
10 0 101X-X111-X
C
The WDT time-out flag after: 1/32s
Yes
TEST
10 0 1110-0000-X
C
NORMAL
10 0 1110-0011-X
C
Yes
Note: X: Don’t care
A5~A0: RAM addresses
D3~D0: RAM data
D/C: Data/command mode
Def.: Power on reset default
All the bold forms, namely 110, 101, and 100, are mode commands. Of these, 100
indicates the command mode ID. If successive commands have been issued, the command mode ID
except for the first command will be omitted. The source of the tone frequency and of the time
base/WDT clock frequency can be derived from an on-chip 256kHz RC oscillator, a 32.768kHz
crystal oscillator, or an external 256kHz clock. Calculation of the frequency is based on the system
frequency sources as stated above. It is recommended that the host controller should initialize the
SS1621 after power on reset, for power on reset may fail, which in turn leads to the malfunctioning
of the SS1621.
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