HT16514 datasheet(3/39 Pages) HOLTEK

3 / 39 page

Pin Description

Pin Name

I/O

Description

Logic System (Microprocessor Interface)

RS, ST

When parallel mode is selected, this pin is utilized to select the register, either Instruction Reg-

ister or Data Register.

0: IR (Instruction Register)

1: DR (Data Register)

When serial mode is selected, this pin performs strobe input. Data can be set as input when

this signal goes 0.

During the next rising edge of this signal, command processing is performed.

E (RD), SCK

When M68 parallel mode is selected (E), this pin is write enable. Writes data at the falling edge.

When i80 parallel mode is selected (RD), this pin is read enable. When this pin is

²Low², data is

output to the data Bus.

When Serial mode is selected, this pin is shift clock input, data will be written at the rising edge.

When this pin is

²Low², the device is active.

OSCI

OSCO

Connected to an external resistor to generate an oscillation frequency.

XOUT

Oscillator signal output pin

R,W(WR)I

When M68 parallel mode is selected (R, W), this pin is data mode select pin

(0: write, 1: read).

When i80 parallel mode is selected (WR), this pin is a write enable pin. Data will be written at

rising edge signal.

When serial mode is selected, connect this pin to

²Hi² or ²Low². Read or Write is chosen by in-

struction.

SI, SO

I/O

When serial mode is selected, this pin is used as I/O pin.

When parallel mode is selected, this pin needs to be connected to

²Hi² or ²Low².

DB0~DB7

I/O

When parallel mode is selected, these pins are used as I/O pins.

Data are stored sequentially, the first bit which is sent to the HT16514 is MSB.

If 4 bits mode is selected, only DB4~DB7 are used.

RESET

Initialize all the internal register and commands.

All segments and digits are fixed PGND.

DS0, DS1

Set the duty ratio. Duty ratio will determine the number of grid.

The relationship between duty ratio and these pins is shown in Table 1-1.

Select interface mode (parallel mode or serial mode)

0: Serial mode

1: Parallel mode

In parallel mode, instruction will determine the length of word.

MPU

Select interface mode (i80 type CPU mode or M68 type CPU mode)

0: i80 type CPU mode

1: M68 type CPU mode

DLS

Select number of display line when power ON reset or resetting.

0: Select 1 line (N=0),

²N² is display line select flag in Function set command.

1: Select 2 line (N=1)

RL1, RL2

Set segment outputs pin assignment. The selection table is listed as Table 1-2 & Table 1-7

TESTI

0 or open: Normal operation mode

1: Test mode

TESTO

For IC testing only, leave this pin open.

Logic System ( To External Extension Driver)

SDO

Serial data output for extension digit driver.

SLK

Shift clock pulse for extension digit driver.

Active during rising edge

HT16514

Rev. 1.00

October 4, 2006

HT16514 датащи(PDF) 3 Page - Holtek Semiconductor Inc

HT16514 датащи(HTML) 3 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

датащи скачать

ссылки URL