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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Download the Holtek HT1621 LCD Controller Datasheet

The LCD screen will appear blank. The library consists in only one header and an implementation files: The configuration of the system oscillator is as shown.

The tone generator can output a pair of differential driving signals on the BZ and BZ, which are used to generate a single tone. The information appearing in this Data Sheet is believed ddatasheet be accurate at the time of publication.

This chip has a 32×4 bits static display RAM which is mapped directly to the display driver.

Chip selection BZ, BZ: 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. For the most up-to-date information, please visit our web site at http: Once the system is disabled or the dtasheet output is inhibited, the BZ and the BZ outputs will remain at low level.


Holtek reserves the right to alter its products without prior notification. 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 malfunctioning of the HT The 32kHz in the above equation indicates that the source of the system frequency is derived from a crystal oscillator of The configuration of the time base generator along with the WDT are as shown.

There are only two tone frequencies, namely: We have written a library to deal with all the features of HT 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. However, Holtek assumes no responsibility arising from the datashedt of the specifications described.

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

The serial interface circuit is also reset. In order to obtain the correct frequency, two additional load capacities C1, C2 are needed.

Power on reset default All the bold forms, namely 1 1 0, 1 0 hg1621b, and 1 0 0, are mode commands. The bold form of 1 0 0, namely 1 0 0, indicates the command mode ID.

HT1621B Datasheet

The value of the capacity depends on how accurate the crystal is. We suggest that you can follow the table, which suggests the value of capacities.

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. The LCD corresponding commands are summarized in the table.


The simulated RAM is used as a default. The clocked out data will appear on the DATA line.

Macduino: HT a seven segments LCD driver

Memory structure of the HT 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. If successive commands have been issued, the command mode ID except for the first command will be omitted. The host controller can use datwsheet next rising edge to latch the clocked out data.

Data to be read or written or commands to be written have to be passed through the DATA line.

Yes Yes Yes Yes X: Friday, February 6, HT 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.

But if CS is at logic low level and is input to the Datsaheet pad, the data and command transmission between the host controller and the HT are all enabled.