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參數(shù)資料
| 型號： | HT1621 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | RAM Mapping 32 x 4 LCD Controller for I/O μC(存儲器映射、用于I/O接口微機(jī)的32 x 4模式LCD控制器) |
| 中文描述： | 內(nèi)存映射32 × 4 LCD控制器的I / O微控制（存儲器映射，用于的I / O接口微機(jī)的32 × 4模式液晶顯示控制器） |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 168K |
| 代理商： | HT1621 |
HT1621
11
January 10, 2001
TIMER command. The CLR WDT or the CLR
TIMER command should be executed prior to
the WDT EN or the TIMER EN command re-
spectively. Before executing the IRQ EN com-
mand the CLR WDT or CLR TIMER command
should be executed first. The CLR TIMER com-
mand has to be executed before switching from
the WDT mode to the time base mode. Once the
WDT time-out occurs, the IRQ pin will stay at a
logic low level until the CLR WDT or the IRQ
DIS command is issued. After the IRQ output is
disabled the IRQ pin will remain at the floating
state. The IRQ output can be enabled or dis-
abled by executing the IRQ EN or the IRQ DIS
command, respectively. The IRQ EN makes the
output of the time base generator or of the WDT
time-outflagappearontheIRQpin.Theconfig-
uration of the time base generator along with
the WDT are as shown. In the case of on-chip
RC oscillator or crystal oscillator, the power
down mode can reduce power consumption
since the oscillator can be turned on or off by
the corresponding system commands. At the
power down mode the time base/WDT loses all
its functions.
On the other hand, if an external clock is se-
lected as the source of system frequency the
SYS DIS command turns out invalid and the
power down mode fails to be carried out. That
is, after the external clock source is selected,
the HT1621 will continue working until system
power fails or the external clock source is re-
moved. After the system power on, the IRQ will
be disabled.
Tone output
A simple tone generator is implemented in the
HT1621. The tone generator can output a pair
of differential driving signals on the BZ and BZ,
which are used to generate a single tone. By ex-
ecuting the TONE4K and TONE2K commands
there are two tone frequency outputs
selectable. The TONE4K and TONE2K com-
mands set the tone frequency to 4kHz and
2kHz, respectively. The tone output can be
turned on or off by invoking the TONE ON or
the TONE OFF command. The tone outputs,
namely BZ and BZ, are a pair of differential
driving outputs used to drive a piezo buzzer.
Once the system is disabled or the tone output
is inhibited, the BZ and the BZ outputs will re-
main at low level.
LCD driver
The HT1621 is a 128 (32 4) pattern LCD driver.
It can be configured as 1/2 or 1/3 bias and 2 or 3
or 4 commons of LCD driver by the S/W configu-
ration.ThisfeaturemakestheHT1621suitable
for multiply LCD applications. TheLCDdriving
clock is derived from the system clock. The value
of the driving clock is always 256Hz even when it
is at a 32.768kHz crystal oscillator frequency, an
on-chip RC oscillator frequency, or an external
frequency. The LCD corresponding commands
are summarized in the table.
The bold form of 1 0 0, namely
1 0 0
, indicates
the command mode ID. If successive commands
have been issued, the command mode ID except
forthefirstcommand,willbeomitted.TheLCD
Name
Command Code
Function
LCD OFF
1 0 0
0 0 0 0 0 0 1 0 X
Turn off LCD outputs
LCD ON
1 0 0
0 0 0 0 0 0 1 1 X
Turn on LCD outputs
BIAS & COM
1 0 0
0 0 1 0 a b X c X
c=0: 1/2 bias option
c=1: 1/3 bias option
ab=00: 2 commons option
ab=01: 3 commons option
ab=10: 4 commons option
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相關(guān)代理商/技術(shù)參數(shù) |
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| HT1621(100QFP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Controller Miscellaneous - Datasheet Reference |
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| HT1621B | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:RAM Mapping 324 LCD Controller for I/O MCU |
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