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參數資料
| 型號： | HT1647 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 4-Level Gray Scale 64 x 16 LCD Controller for I/O Μc(4級灰標、用于I/O接口微機的64 x 16模式 LCD控制器 Controller for I/O Μc) |
| 中文描述： | 4級灰度64 × 16 LCD控制器的I / O微晶（4級灰標，用于的I / O接口微機的64 × 16模式液晶顯示控制器控制的I / O微晶） |
| 文件頁數： | 13/24頁 |
| 文件大小： | 190K |
| 代理商： | HT1647 |
HT1647
13
April 21, 2000
Time base and Watchdog Timer
WDT
The time base generator and WDT share the
same divided (/256) counter. 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.
OncetheWDTtime-outoccurs,theIRQpinwill
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.
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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
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 and turn on tone output. The TONE
4K and TONE 2K commands set the tone fre-
quency 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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相關代理商/技術參數 |
參數描述 |
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| HT1647(100QFP)A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Controller Miscellaneous - Datasheet Reference |
| HT1647_05 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:4-Level Gray Scale 64x16 LCD Controller for I/O MCU |
| HT1647_10 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:4-Level Gray Scale 6416 LCD Controller for I/O MCU |
| HT1647A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:64x16 LCD Controller for I/O MCU |
| HT1647A_11 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:64x16 LCD Controller for I/O MCU |
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