GL603USB datasheet(20/41 Pages) ETC

20 / 41 page

09/22/00

GL603USB/GL603USB-A/GL603USB-B

Revision 1.4

0: Indicate the corresponding pin on Port 2 cannot be used in input mode. But even firmware

cannot read this pin directly from Port 2 directly, this pin can be selected with PHSEL and

firmware can get its state from PHVAL also.

Value on POR: “0 0 0 0 0 0 0 0”

PSCON (Address 81h, Prescaler control register)

R/W

PSDIS

PS2

PS1

PS0

PSDIS: Prescaler disable bit

1: Set prescaler disable

0: Set prescaler enable

PS[2:0]: Prescaler rate select bits. These bits are used to control timer speed. The following table means

that how many instruction cycles the TIMER register should be added by 1 when PSDIS = 0.

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

P1CON6

P1CON5

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.

Except to control PORT1.1 output driver, a special function is applied to P1CON1. Clock generator in

GL603USB can be enabled only when P1CON1 is cleared. When a 6 MHz crystal or resonator is used and

P1CON1 is set, GL603USB cannot running on 12 MHz, even if clock generator is enabled by code option.

Value on POR: “- 1 1 1 1 1 1 1”

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

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

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