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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)： | 13/22頁 |
| 文件大?。?/td> | 201K |
| 代理商： | HT1647(100QFP)A |
HT1647
Rev. 1.00
13
June 1, 2001
Time base and Watchdog Timer
WDT
The time base generator and WDT share the
same counter which is divided by 256. The IRQ
clock can be programmed as 1Hz, 2Hz, ...., 128Hz
output. TIMER DIS/EN/CLR, WDT DIS/EN/CLR
and IRQ EN/DIS are independent from each
other. Once the WDT time-out occurs, the IRQ
pin will remain at a logic low level until the
CLR WDT or the IRQ DIS command is issued.
If an external clock is selected as the system
frequency source, the SYS DIS command turns
out invalid and the power down mode fails to be
carried out until the external clock source is re-
moved.
Buzzer tone output
A simple tone generator is implemented in the
HT1647. 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 executing the TONE 4K and TONE 2K com-
mands there are two tone frequency outputs
selectable that can turn on the tone output. The
TONE 4K and TONE 2K commands set the
tone frequency to 4kHz and 2kHz, respectively.
The tone output can be turned off by invoking
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.
Command format
The HT1647 can be configured by software set-
ting. There are two mode commands to config-
ure the HT1647 resource and to transfer the
LCD display data.
The configuration mode of the HT1647 is called
command mode, and its command mode ID is
100. The command mode consists of a system
configuration command, a system frequency se-
lection command, an LCD configuration com-
mand, a tone frequency selection command, a
bias current selection command, a gray scale
level selection command, a timer/WDT setting
command, and an operating command. The
data mode, on the other hand, includes READ,
WRITE, and READ-MODIFY-WRITE opera-
tions.
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Time base and WDT configurations
Name
Command Code
Function
TONE OFF
X100
-0000-1000-XXXX
Turn-off tone output
TONE 4K
X100
-0001-0000-XXXX
Turn-on tone output, tone frequency is 4kHz
TONE 2K
X100
-0001-0001-XXXX
Turn-on tone output, tone frequency is 2kHz
Buzzer tone output command code
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