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HT1670 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT1670 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
11 / 20 page HT1670 Rev. 1.60 11 November 9, 2010 PATENTED Buzzer Tone Output A simple tone generator is implemented in the HT1670. The tone generator can output a pair of differential driv- ing signals on the BZ and BZ which are used to generate 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 commands set the tone frequency to 4kHz and 2kHz, 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 ²1² and the previous operation mode will also be reset. The CS pin returns to ²0², so a new operation mode ID should be issued first. W D T E N / D I S I R Q E N / D I S D C K Q R C L R W D T C l o c k S o u r c e ¸ 4 ¸ 2 5 6 T i m e B a s e C L R T i m e r I R Q W D T V D D T I M E R E N / D I S 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 If successive commands have been issued, the command mode ID can be omitted. While the system is operating in the non-successive address data mode, the CS pin 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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