LSI

LS5015

2

Functional Description

1. RC Oscillator /Crystal

The LS5015 can use either a crystal oscillator or RC oscillator to provide the internal timing by mask

option.

2. Program ROM

The LS5015 has internal 512x12 bit ROM providing simple operation. It has four internal stack.

3. Program RAM

The system has 20x4bit of program RAM (00H to 13H).

4. Buzzer Control

The system can output 2khz alarm signal. Buzzer control address at 4H.

5. LCD driver

The system has 10 LCD segment pad with 3 common pads providing 10x3 LCD segment output. It

can only support 4 digit plus 2 dot LCD format. The LCD decode the data at RAM 0,1,2,3 for the 4 digit

LCD display. The 2 dot (named: AA, BB) is controlled by RAM 12H:D2 as AA and 12H:D3 as BB.

6. I/O pad

The LS5015 has 6 input pad, I[0:5], and 4 output pad O[0:3].

The input pads can be selected (by

mask option) with/without internal pull-low resistor.

The output pads can be selected by mask

option to be CMOS or OPEN DRAIN output.