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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The library consists in only one header and an implementation files: That is, after the external clock source is selected, the HT will continue working until system power fails or the external clock source is removed. The LCD screen will appear blank. Data to be read or written or commands to be written have to be passed through the DATA line.

Power on reset default All the bold forms, namely 1 1 0, 1 0 1, and 1 0 0, are mode commands. We suggest that you can follow the table, which suggests the value of capacities. The crystal oscillator option can be applied to connect an external frequency source of 32kHz to the OSCI pin.

Holtek reserves the right to alter its products without prior notification. As this information may be updated at regular intervals users are reminded to consult the Holtek website http: The tone outputs, namely BZ and BZ, are a pair of differential driving outputs used to drive a piezo buzzer.

The serial interface circuit is also reset.

The host controller can use the next rising edge to latch the clocked out data. The source of the clock may be from an on-chip RC oscillator kHza crystal oscillator Adresses are organized as displayed in Figure 2. The bold form of 1 0 0, namely 1 0 0, indicates the command mode ID. However, Holtek assumes no responsibility arising from the use of the specifications daatasheet. The value of the driving clock is always Hz even when it is at a But if CS is datasheft logic low level and is input to the CS pad, the data and command transmission between the host controller and the HT are all enabled.


In order to obtain the correct frequency, two additional load capacities C1, C2 are needed. Yes Yes Yes Yes X: Friday, February 6, HT The LCD driving clock is derived from the system clock.

Command The mode command should be issued before the data or command is transferred. There are totally eight frequency sources available for the time base generator and the WDT clock. If successive commands have been issued, the command mode ID except for the first command will be omitted.

HTB Datasheet(PDF) – Holtek Semiconductor Inc

If successive commands have been issued, the command mode ID except for the first command, will be omitted. Memory structure of the HT The clocked out data datadheet appear on the DATA line. Only three or four lines are required for the datashheet between the host controller and the HT We provide a very basic sketch for testing the main functions. Finally, a class for a specific 7-seg LCD module that I found at bargains.

A generic LCD initialization sequence will consist of the following steps: In the case of on-chip RC oscillator or crystal oscillator, the power down mode can reduce power consumption since the h1t621b can be turned on or off by the corresponding system commands.

An external KHz oscillator can also be used. 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.

The frequency is calculated by daatsheet following equation. The table illustrates the suggestion value of capacities C1, C2.

HT1621B Datasheet

The system clock is used in a variety of tasks included LCD driving clock and tone frequency generation. The value of the capacity depends on how accurate the crystal is. If the system clock comes from an external clock source, the external clock source should be connected to the OSCI pad.


The configuration of the time base generator along with the WDT are as shown. The watch dog timer WDTon the other hand, is composed of an 8-stage time base generator along with a 2-stage count-up counter, and is designed to break the host controller or other subsystems from abnormal states such as unknown or unwanted jump, execution errors, etc. The CS line is used to initialize the serial interface circuit and to terminate the communication between the host controller and the HT Dimensions in mm Min.

The 32kHz in the above equation indicates that the ht162b1 of the system frequency is derived from a crystal oscillator of Here is the functional daatsheet diagram directly extracted from the Holtek datasheet. In the sequel we will describe each of these blocks. The applications mentioned herein are used solely for ht16621b purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a jt1621b to ht162b1 life due to malfunction or otherwise.

Macduino: HT a seven segments LCD driver

But if the external dataaheet 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. We have written a library to deal with all the features of HT X Y Pad No. If the VDD drops below the minimum voltage of operating voltage spec.