HT1620 Ver la hoja de datos (PDF) - Holtek Semiconductor
Número de pieza
componentes Descripción
Fabricante
HT1620 Datasheet PDF : 21 Pages
| |||
PATENTED
HT1621/HT1621G
Name
TONE OFF
TONE ON
CLR TIMER
CLR WDT
XTAL 32K
RC 256K
EXT 256K
BIAS 1/2
BIAS 1/3
TONE 4K
TONE 2K
IRQ DIS
IRQ EN
F1
F2
F4
F8
F16
F32
F64
F128
TEST
NORMAL
ID
100
100
100
100
100
100
100
Command Code
0000-1000-X
0000-1001-X
0000-11XX-X
0000-111X-X
0001-01XX-X
0001-10XX-X
0001-11XX-X
1 0 0 0010-abX0-X
1 0 0 0010-abX1-X
100
100
100
100
010X-XXXX-X
011X-XXXX-X
100X-0XXX-X
100X-1XXX-X
1 0 0 101X-X000-X
1 0 0 101X-X001-X
1 0 0 101X-X010-X
1 0 0 101X-X011-X
1 0 0 101X-X100-X
1 0 0 101X-X101-X
1 0 0 101X-X110-X
1 0 0 101X-X111-X
1 0 0 1110-0000-X
1 0 0 1110-0011-X
D/C
Function
Def.
C Turn off tone outputs
Yes
C Turn on tone outputs
C Clear the contents of time base generator
C Clear the contents of WDT stage
C System clock source, crystal oscillator
C System clock source, on-chip RC oscillator Yes
C System clock source, external clock source
LCD 1/2 bias option
C
ab=00: 2 commons option
ab=01: 3 commons option
ab=10: 4 commons option
LCD 1/3 bias option
C
ab=00: 2 commons option
ab=01: 3 commons option
ab=10: 4 commons option
C Tone frequency, 4kHz
C Tone frequency, 2kHz
C Disable IRQ output
Yes
C Enable IRQ output
C
Time base/WDT clock output:1Hz
The WDT time-out flag after: 4s
C
Time base/WDT clock output:2Hz
The WDT time-out flag after: 2s
C
Time base/WDT clock output:4Hz
The WDT time-out flag after: 1s
C
Time base/WDT clock output:8Hz
The WDT time-out flag after: 1/2s
C
Time base/WDT clock output:16Hz
The WDT time-out flag after: 1/4s
C
Time base/WDT clock output:32Hz
The WDT time-out flag after: 1/8s
C
Time base/WDT clock output:64Hz
The WDT time-out flag after: 1/16s
C
Time base/WDT clock output:128Hz
The WDT time-out flag after: 1/32s
Yes
C Test mode, user don¢t use.
C Normal mode
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 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 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 control-
ler should initialize the HT1621 after power on reset, for power on reset may fail, which in turn leads to the mal-
functioning of the HT1621.
Rev. 2.90
14
November 9, 2010
Share Link: 