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 value of the driving clock is always Hz even when it is at a That command is, however, available only for the on-chip RC oscillator or for the crystal oscillator. There are only two tone frequencies, namely: If the system clock comes from an external clock source, the external clock source should be connected to the OSCI pad.

We suggest that you can follow the table, which suggests the value of capacities. The LCD driving clock is derived from the system clock. X Y Pad No. The tone generator can output a pair of differential driving signals on the BZ and BZ, which are used to generate a single tone. A simple tone generator is implemented in the HT 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 HT contains a power down command to reduce power consumption. 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. Remark that we have. 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.

Chip selection BZ, BZ: 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. We provide procedures to software simulate the internal HT internal RAM and have transparent reading procedures.


We provide a very basic sketch for testing the main functions. Power on reset default All the bold forms, namely 1 1 0, 1 0 1, and 1 0 0, are mode commands. Calculation of the frequency is based on the system frequency sources as stated above. 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.

Holtek reserves the right to alter its products without prior notification. 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.

HT1621B Datasheet

Memory structure of the HT The watch dog timer WDTon the other hand, is composed of an dataasheet 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 datxsheet jump, execution errors, etc. It is recommended that the host controller read in correct data during the interval between the rising edge and the next falling edge of the RD signal.

In this case, the system fails to enter the power down mode, similar to the case in the external kHz clock source operation. The table illustrates the suggestion value of capacities C1, C2.

The source of the clock may be from an on-chip RC oscillator kHza crystal oscillator In the sequel we will describe each of these blocks. The system clock is used in a variety of tasks included LCD driving clock and tone frequency generation. Dimensions ddatasheet mm Min. Yes Yes Yes Yes X: For the most up-to-date information, please visit our web site at http: 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.


These are stress ratings only. An external KHz oscillator can also be used. The following are the data mode IDs and the command datashheet ID: Taipei Sales Office 4F-2, No. Finally, a class for a specific 7-seg LCD module that I found at bargains. But if the external clock source is chosen as the system clock, using the SYS DIS command can dtaasheet turn the oscillator off nor carry out the power down mode. A generic LCD initialization sequence will consist of the following steps: If successive commands have been issued, the command mode ID except for the first command, will ht161b omitted.

This chip has a 32×4 bits static display RAM which is mapped directly to the display driver. The library consists in only one header and an implementation files: The configuration of the system datashret is as shown.

HTB Datasheet PDF – Holtek Semiconductor

If successive commands have been issued, the command mode ID except for the first command will be omitted. The crystal oscillator option can be applied to connect an external frequency source of 32kHz to the OSCI pin.

The applications mentioned herein are used solely for the 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 risk to human life due to malfunction or otherwise.

However, Holtek assumes no responsibility arising datashwet the use of the specifications described. The LCD corresponding commands are summarized in the table. 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.