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參數(shù)資料
| 型號： | HT1647(100QFP)A |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項-數(shù)據(jù)表參考 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大小： | 201K |
| 代理商： | HT1647(100QFP)A |
HT1647
Rev. 1.00
9
June 1, 2001
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Functional Description
System oscillator
The HT1647 system clock is used to generate
the time base/Watchdog Timer (WDT) clock fre-
quency, LCD driving clock, and tone frequency.
The clock source may be from an on-chip RC os-
cillator (32kHz), a crystal oscillator
(32.768kHz), or an external 32kHz clock by the
S/W setting. The configuration of the system os-
cillator is as shown. After the SYS DIS com-
mand is executed, the system clock will stop
and the LCD bias generator will turn off. That
command is available only for the on-chip RC
oscillator or for the crystal oscillator. Once the
system clock stops, the LCD display will be-
come blank, and the time base/WDT loses its
function as well.
The LCD OFF command is used to turn the
LCD bias generator off. After the LCD bias gen-
erator switches off by issuing the LCD OFF
command, using the SYS DIS command re-
duces power consumption, thus serving as a
system power down command. But if the exter-
nal clock source is chosen as the system clock,
using the SYS DIS command can neither turn
the oscillator off nor carry out the power down
mode. The crystal oscillator option can be ap-
plied to connect an external frequency source of
32kHz to the OSCI pin. In this case, the system
fails to enter the power down mode, similar to
the case in the external 32kHz clock source op-
eration. At the initial system power on, the
HT1647 is at the SYS DIS state.
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System oscillator configuration
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