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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X Y Pad No. Chip selection BZ, BZ: The system clock is used in a variety of tasks included LCD driving clock and tone frequency generation. The watch datashdet 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 datqsheet or unwanted jump, execution errors, etc. The crystal oscillator option can be applied to connect an external frequency source of 32kHz to the OSCI pin.

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.

These are stress ratings only. We have written a library to deal with all the features of HT But if CS is at logic low level and is ht161b to the CS pad, the dafasheet and command transmission between the host controller and the HT are all enabled. The library consists in only one datashest and an implementation files: Data to be read or written or commands to be written have to be passed through the DATA line.


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.

We suggest that you can follow the table, which suggests the value of capacities. 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.

Holtek HTB Datasheet

The serial interface circuit is also reset. The value of the driving clock is always Hz even when it is at a Of these, 1 0 0 indicates the command mode ID. The value of the capacity depends on how accurate the crystal is. 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.

The configuration of the time base generator along with the WDT are as shown. We provide a very basic sketch for testing the main functions. That command is, however, available only for the on-chip RC oscillator or for the crystal oscillator.

Finally, a class for a specific 7-seg LCD module that I found at bargains. An external KHz oscillator can also be used. Taipei Sales Office 4F-2, No.

Download the Holtek HT1621 LCD Controller Datasheet

Memory structure of the HT We provide procedures to software simulate the internal HT internal RAM and have transparent reading procedures. 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. In the case of on-chip RC oscillator or crystal oscillator, the power down mode can reduce datasheef consumption since the oscillator can be hf1621b on or off by the corresponding system commands.


The configuration of the system oscillator is as shown. The HT contains a power down command to reduce power consumption.

HT1621B Datasheet

The tone outputs, namely BZ and BZ, are a pair of differential nt1621b outputs used to drive a piezo buzzer. The frequency is calculated by the following equation. The LCD driving clock is derived from the system clock. The tone generator can output a pair of differential driving signals on the BZ and BZ, which are used to generate a single tone.

Once the system is disabled or the tone output is inhibited, the BZ and the BZ outputs will remain at low level. 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.

Friday, February 6, HT A simple tone generator is implemented in the HT The LCD screen will appear blank. But if the external clock source is chosen as the system clock, using the SYS DIS command can neither ddatasheet the oscillator off nor carry out the power down mode.

Dimensions in mm Min.

The host controller can use the next rising edge to latch the clocked out data.