HT16514 datasheet(35/39 Pages) HOLTEK

35 / 39 page

Power ON Reset

After a power-on reset, the module is initialize to the following conditions:

· All DDRAM locations are set to 20H (character code for a space).

· The cursor position is set to DDRAMaddress 00H

· The relationship between DDRAM addresses and character positions on the VFD is set to the non-shifted position.

· Entry Mode Set instruction bits:

I/D=1: The cursor position increments after each DDRAM or CGRAM access.

If S=1, the information on the display shifts to the left by one character position after each DDRAM write.

S=0:

The display shift function is disabled.

· Display On/Off Control instruction bits:

D=0:

The display is off (display blank).

C=0:

The cursor is off.

B=0:

The blinking character function is disabled.

· Function Set instruction bits:

DL=1: Sets the data bus width for the parallel interface modes to 8 bits (DB7~DB0).

N=1:

Number of display lines is set to 2.

BR1, BR0=0,0: Sets the luminance level to 100%.

· MPU interface, duty ratio selection are based on the following table.

Relationship between Status of HT16514 and Pin Selection at Power on Reset

Pin Name

Function

Remark

TEST

DS1 DS0

Self test mode

This is effective on aging.

0 or open

Serial interface

SI, SO, SCK, ST

0 or open

Parallel interface

RS, E, R, W, DB7~DB4 or DB7~DB0

0 or open

Duty= 1/16 (16C

´1 or 2L display)

¢s not necessary to use the extension driver.

The number of line is selected by instruction.

0 or open

Duty= 1/20 (20C

´1 or 2L display)

0 or open

Duty= 1/24 (24C

´1 or 2L display)

0 or open

Duty= 1/40 (40C

´1 or 2L display)

Extension driver should be used.

The number of line is selected by instruction.

HT16514

Rev. 1.00

October 4, 2006

HT16514 Datasheet(PDF) 35 Page - Holtek Semiconductor Inc

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