HTB RAM Mapping 32×4 LCD Controller For I/o uc Features. Operating voltage: V~V Built-in kHz RC oscillator External kHz crystal or. Holtek HTB: available from 7 distributors. Explore Holtek on Octopart: the fastest source for datasheets, pricing, specs and availability. HT/HTG RAM Mapping 32´4 LCD Controller for I/O MCU PATENTED PAT No.: TW Features · Operating voltage: V~V · 32´4 LCD driver .

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Of these, 1 0 0 indicates the command mode ID.

HT1621B Datasheet

Yes Yes Yes Yes X: The library consists in only one header and an implementation files: That is, after the external clock source is selected, the HT will continue datasjeet until system power fails or the external clock source is removed.

A simple tone generator is implemented in the HT The host controller can use the next rising edge to latch the clocked out data. These are stress ratings only. Calculation of the frequency is based on the system frequency sources as stated above. Friday, February 6, HT The LCD corresponding commands are summarized in the table.

A generic LCD initialization sequence will consist of the following steps: The table illustrates the suggestion value of capacities C1, C2. Adresses are organized as displayed in Figure 2.

Download the Holtek HT LCD Controller Datasheet Version

The serial interface circuit is also reset. The LCD screen will appear blank. If successive commands have been issued, the command mode ID except for the first command, will be omitted. As this information may be updated at regular intervals users are reminded to consult the Holtek website http: The value of the capacity depends on how accurate the crystal is. Once the system datashwet disabled or the tone output dztasheet inhibited, the BZ and the BZ outputs will remain at low level.


The outputs htt1621b the time base generator and of the WDT time-out flag can be connected to the IRQ output by a command option. The CS line is used to initialize the serial interface circuit and to terminate the communication between the host controller and the HT We provide a very basic sketch for testing the main functions. Remark that we have.

Data to be read or written or commands to be written have to be passed through the DATA line. Taipei Sales Office 4F-2, No. The frequency is xatasheet by the following equation.

The tone outputs, namely BZ and BZ, are a pair of differential driving outputs used to drive a piezo buzzer. The information appearing in this Data Sheet is believed to be accurate at the time of publication. The following are the data mode IDs and the command mode ID: The configuration mode of the HT is called command mode, and its command mode ID is 1 0 0.


Finally, a class for a specific 7-seg LCD module that I found at bargains. We dwtasheet procedures to software simulate the internal HT internal RAM and have transparent datashert procedures. However, Holtek assumes no responsibility arising from the use of the specifications described.

There are only two tone frequencies, namely: We have written a library to deal with all the features of HT The 32kHz in the above equation indicates that the source of the system frequency is derived from a crystal oscillator of The system clock is used in a variety of tasks included LCD driving clock and tone frequency generation. The HT contains a power down command to reduce power consumption.

The clocked out data will appear on the DATA line. The LCD driving clock is derived from the system clock. If an on-chip oscillator kHz or an external kHz frequency is chosen as the source of the system frequency, the frequency source is by default prescaled to 32kHz by a 3-stage prescaler. But if the external 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.