18

06/19/2000

GL600USB/GL600USB-A/GL600USB-B

Revision 1.3

Bit Value

Timer Rate

(PSDIS = 0)

000

1:2

001

1:4

010

1:8

011

1:16

100

1:32

101

1:64

110

1:128

111

1:256

Value on POR: “- - - - 1 1 1 1”

PORT1CON (Address 86h, Port 1 direction control register)

R/W

R/W

R/W

R/W

R/W

P1CON4

P1CON3

P1CON2

P1CON1

P1CON0

There is a data direction control bit to match every pin of Port 1. The direction control bits can configure

these pins as output or input. Setting a PORT1CON register bit put the corresponding output driver in a hi-

impedance mode. Clearing a bit in the PORT1CON register puts the contents of the output latch on the

selected pin.

Value on POR: “- - - 1 1 1 1 1”

PORT2CON (Address 87h, Port 2 direction control register)

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

P2CON7

P2CON6

P2CON5

P2CON4

P2CON3

P2CON2

P2CON1

P2CON0

There is a data direction control bit to match every pin of Port 2. The direction control bits can configure

these pins as output or input. Setting a PORT2CON register bit put the corresponding output driver in a hi-

impedance mode. Clearing a bit in the PORT2CON register puts the contents of the output latch on the

selected pin.

Value on POR: “1 1 1 1 1 1 1 1”

4.4

FULL-RANGE DETECTION AND ANALOG-TO-DIGITAL CONVERTER

The GL600USB provides the unique “Full-Range Detection” ability. Over 95% of PC mouse market adopts

photo-sensor system to detect the mechanical movement of the roller inside the mouse. Because the

sensors may have varied characteristic on their output DC voltage level and output moving range, the

mouse manufacturers can’t avoid the expensive process of matching LED and photo-sensor. By providing

those photo-input pins with full-range detection function, the mouse makers can ignore the range difference

between those sensors, so the manufacturing procedure is simple and a huge cost is saved on the

manufacturing line.

By detecting the output signal came from the sensors, Genesys Logic’s patented algorithm could learn the

tiny difference of every signal and automatically adjust the threshold for the sensors without any side effect.

This new outstanding design can help the manufacturers decrease their inconvenience on mass -production

line and cut their human and mechanical cost tremendously.

There’s a 4-bit Analog-to-Digital Converter (ADC) module in the GL600USB. The input signal of ADC

can be connected to Port 2.0 ~ Port 2.7. When these I/O pins is used for analog input, the corresponding

bits in DMODE register should be set to 0 to disable input buffer of Port 2. This can save power consumed

by the pad of Port 2. The PHSEL register is used to select which input connected to the ADC and the

PHVAL register is used to store the digital value converted by the ADC. The Genesys Logic’s proprietary