Block Diagram

Pin Description

Pin Name

I/O

Internal

connection

Description

MS

I

—

When this pin is connected to VDD, then HT6513 is assigned

to operate under the microsoft mode only. If the pin is

connected to VSS, then HT6513 will operate under the mouse

system mode. If MS pin is “floating”, the HT6513 is on the

power on initiation mode.

TEST

I

Pull-Low

For IC test only. The test pin must be connected to VSS, while

the chip is under normal usage.

OSCI

I

—

Oscillator input pin

OSCO

O

—

Oscillator output pin

RTS

I

—

The signal is sent by the mouse driver from the computer to

select the mode.

The HT6513 replies with the selected mode to the RXD line

after the pulse signal of the RTS line. RXD will send out “CD”H

code under the microsoft mode.

RXD

O

NMOS

Open Drain

There are 7 or 8 bits in each data byte. Using parallel-in and

serial-out circuit, the data bytes are shifted out from bit 0

through the most significant bit. HT6513 will transmit the

data when the status of the three key-switches or the state of

the horizontal counter or vertical counter change.

VSS

I

—

Negative power supply

HT6513

2

23rd Oct ’96