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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But if CS is at 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 the sequel we will describe each of these blocks.

The LCD corresponding commands are summarized in the table. Finally, a class for a specific 7-seg LCD module that I found at bargains. In order to obtain the correct frequency, two additional load capacities C1, C2 are needed. The clocked out data will appear on the DATA line.

HTB (HOLTEK) PDF技术资料下载 HTB 供应信息 IC Datasheet 数据表 (4/20 页)

Chip selection BZ, BZ: It is recommended that the host controller should initialize the HT after power on reset, for power on reset may fail, which in turn leads to the adtasheet of the HT Only three or four lines are required for the interface between the host controller and the HT That is, after the external datazheet source is selected, the HT will continue working until system power fails or the external clock source is removed.

If successive commands have been issued, the command mode ID except for the first command, will be omitted. 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 dayasheet abnormal states such as unknown or unwanted jump, execution errors, etc.

Memory structure of the HT If successive commands have been issued, the command mode ID except for the first command will be omitted.


Friday, February 6, HT The LCD driving clock is derived from the system clock. As this information may be updated at regular intervals users are reminded to consult the Holtek website http: There are only two tone frequencies, namely: Remark that we have. In this case, the system fails to enter the power down mode, similar to the case in the external kHz clock source operation. The serial interface circuit is also reset. The crystal oscillator option can be applied to connect an external frequency source of 32kHz to the OSCI pin.

Employing both the time base generator and the WDT related commands, one should be careful since the time base generator and WDT share the same 8-stage counter. The simulated RAM is used as a default. Taipei Sales Office 4F-2, No. The value of the driving clock is always Hz even when it is at a Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

Download the Holtek HT1621 LCD Controller Datasheet

In the next post we will provide a class for dealing with a generic 7-segments LCD module based on the HT chip with instruction set similar to the classical LiquidCrystal library here. This chip has a 32×4 bits static display RAM which is mapped directly to the display driver. The outputs of the time base generator and of the WDT time-out flag can be connected to the IRQ output by a command option.

In the case of on-chip RC oscillator or crystal oscillator, the power down mode can reduce power consumption since the oscillator can be turned on or off by the corresponding system commands. The LCD screen will appear blank.

The applications mentioned herein are used solely for the purpose of datasheett 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 risk to human life due to malfunction or otherwise. If successive commands have been issued, the command mode ID, namely 1 0 0, can be omitted.


Calculation of the frequency is based on the system frequency sources as stated above. A generic LCD initialization sequence will consist datashret the following steps: The bold form of 1 0 0, namely 1 0 0, indicates the command mode ID. The source of the clock may be from an on-chip RC oscillator kHza crystal oscillator We suggest that you can follow the table, which suggests the value of capacities. The value of the capacity depends on how accurate the crystal is.

The HT contains a power down command to reduce power consumption.

HTB Datasheet pdf – RAM Mapping 324 LCD Controller for I/O MCU – Holtek Semiconductor

An external KHz oscillator can also be used. The tone outputs, namely BZ and BZ, are a pair of differential driving outputs used to drive a piezo buzzer. It is recommended that the host controller should read in the data from the DATA line between the rising edge of the RD line and the falling edge of the next RD line.

We provide a very basic sketch for testing the main functions. The library dagasheet in only one header and an implementation files: If the CS pin is set to 1, the data and command issued between the host controller and the HT are first disabled and then initialized. datadheet

We provide procedures to software simulate the internal HT internal RAM and have transparent reading procedures. That command is, however, available only for the on-chip RC oscillator or for the crystal oscillator. The configuration mode of the HT is called command mode, and its command mode ID is 1 0 0.

Dimensions in mm Min.