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HT1621 Datasheet(PDF) 14 Page - Holtek Semiconductor Inc

Part No. HT1621
Description  RAM Mapping 324 LCD Controller for I/O MCU
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Maker  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
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HT1621 Datasheet(HTML) 14 Page - Holtek Semiconductor Inc

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HT1621/HT1621G
Rev. 2.90
14
November 9, 2010
PATENTED
Name
ID
Command Code
D/C
Function
Def.
TONE OFF
100
0000-1000-X
C
Turn off tone outputs
Yes
TONE ON
100
0000-1001-X
C
Turn on tone outputs
CLR TIMER
100
0000-11XX-X
C
Clear the contents of time base generator
CLR WDT
100
0000-111X-X
C
Clear the contents of WDT stage
XTAL 32K
100
0001-01XX-X
C
System clock source, crystal oscillator
RC 256K
100
0001-10XX-X
C
System clock source, on-chip RC oscillator
Yes
EXT 256K
100
0001-11XX-X
C
System clock source, external clock source
BIAS 1/2
100
0010-abX0-X
C
LCD 1/2 bias option
ab=00: 2 commons option
ab=01: 3 commons option
ab=10: 4 commons option
BIAS 1/3
100
0010-abX1-X
C
LCD 1/3 bias option
ab=00: 2 commons option
ab=01: 3 commons option
ab=10: 4 commons option
TONE 4K
100
010X-XXXX-X
C
Tone frequency, 4kHz
TONE 2K
100
011X-XXXX-X
C
Tone frequency, 2kHz
IRQ DIS
100
100X-0XXX-X
C
Disable IRQ output
Yes
IRQ EN
100
100X-1XXX-X
C
Enable IRQ output
F1
100
101X-X000-X
C
Time base/WDT clock output:1Hz
The WDT time-out flag after: 4s
F2
100
101X-X001-X
C
Time base/WDT clock output:2Hz
The WDT time-out flag after: 2s
F4
100
101X-X010-X
C
Time base/WDT clock output:4Hz
The WDT time-out flag after: 1s
F8
100
101X-X011-X
C
Time base/WDT clock output:8Hz
The WDT time-out flag after: 1/2s
F16
100
101X-X100-X
C
Time base/WDT clock output:16Hz
The WDT time-out flag after: 1/4s
F32
100
101X-X101-X
C
Time base/WDT clock output:32Hz
The WDT time-out flag after: 1/8s
F64
100
101X-X110-X
C
Time base/WDT clock output:64Hz
The WDT time-out flag after: 1/16s
F128
100
101X-X111-X
C
Time base/WDT clock output:128Hz
The WDT time-out flag after: 1/32s
Yes
TEST
100
1110-0000-X
C
Test mode, user don
¢t use.
NORMAL
100
1110-0011-X
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 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 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.


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