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參數(shù)資料
| 型號(hào)： | HT1670 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 128x32 LCD Controller for I/O MCU |
| 中文描述： | 128x32 LCD控制器的I / O控制器 |
| 文件頁(yè)數(shù)： | 11/19頁(yè) |
| 文件大小： | 174K |
| 代理商： | HT1670 |
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HT1670
Rev. 1.10
11
September 17, 2004
Buzzer Tone Output
A simple tone generator is implemented in the HT1670.
The tone generator can output a pair of differential driv-
ingsignalsontheBZandBZwhichareusedtogenerate
a single tone.
By executing the TONE 4K and TONE 2K commands
there are two tone frequency outputs selectable that can
turn on the tone output. The TONE 4K and TONE 2K
commandssetthetonefrequencyto4kHzand2kHz,re-
spectively. 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
remain at low level.
Command Format
The HT1670 can be configured by software setting.
There are two mode commands to configure the
HT1670 resource and to transfer the LCD display data.
The configuration mode of the HT1670 is called com-
mand mode, and its command mode ID is 100. The
command mode consists of a system configuration
command, a system frequency selection command, an
LCD configuration command, a tone frequency selec-
tion command, a bias current selection command, a
timer/WDT setting command, and an operating com-
mand. The data mode, on the other hand, includes
READ, WRITE, and READ-MODIFY-WRITE opera-
tions.
The following are the data mode ID and the command
mode ID:
Operation
Mode
ID
READ
Data
110
WRITE
Data
101
READ-MODIFY-WRITE
Data
101
COMMAND
Command
100
If successive commands have been issued, the com-
mand mode ID can be omitted. While the system is op-
erating in the non-successive command or the
non-successive address data mode, the CS pin should
be set to 1 and the previous operation mode will also
be reset. The CS pin returns to 0 , so a new operation
mode ID should be issued first.
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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
The following are the data mode ID and the command ID:
Operation
Mode
ID
READ
Data
110
WRITE
Data
101
READ-MODIFY-WRITE
Data
101
COMMAND
Command
100
Ifsuccessivecommandshavebeenissued,thecommandmodeIDcanbeomitted.Whilethesystemisoperatinginthe
non-successive address data mode, the CSpin should be set 1 and the previous operation mode will also be reset. The
CS pin returns to 0, so a new operation mode ID should be issued first.
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