GL843 datasheet(79/84 Pages) GENESYS

79 / 84 page

GL843 High Speed USB2.0 With ADF 2-in-1 Scanner Controller For 3x

Page 79

When document sheet keeps moving forward, after sensing the absent of document by ADF sensor, scanning

process will be terminated after PSTFED scanning lines.

35 Supports RS232 Interface

GL843 supports RS232 interface via internal logic circuitry. Programmers need to set the RS232SEL control

bit to logic ‘1’. GPIO6 transmits the data of RS232 and GPIO28 receives the data of RS232 under RS232

mode. The baud rate can be programmed to 2400,4800, 9600 and 19200 bps by S/W.

36 Supports EEPROM (93C46) Interface

GL843 supports EEPROM interface via internal logic circuitry. Programmers need to set the EPROMSEL

control bit to logic ‘1’. GPIO1 controls SK of external EEPROM, GPIO2 controls DI/DO of EEPROM and

GPIO17 controls CS of external EEPROM under EEPROM mode.

37 Embedded RISC CPU for Scanning, Run-in and Diagnostic Tests

GL843 embeds a powerful RISC CPU. It has timers, counters and interrupt ports. Designers can use the

embedded CPU to do the run-in, diagnostic tests and anything he wants to do.

38 Supports External 24Kbytes flash ROM or Internal 24Kbyte mask ROM

Designers can use 24K bytes embedded mask ROM or external flash ROM. Firmware can be downloaded to

flash ROM directly by PC S/W. It provides a flexible development environment to design the firmware.

39 Supports Key-Matrix with Latch Function

Designers need to set MATRIXEN control bit to logic ‘1’ to enable key-matrix function. GPIO13~15 are the

scanning output of key-matrix and GPIO1~4 are the scanning input of key-matrix. Designers can select 1*4,

2*4 or 3*4 matrix for different applications.

By resetting MATRIXEN to logic ‘0’, designers can directly use GPIO1~4 as four hot keys inputs.

Any hot key status is latched into key buffer until it is read out.

40 “True gray” with R,G and B weightings

Designers can obtain the “true gray” image data by enabling “true gray” function. Image data is generated by

R,G and B outputs and multiplied by weightings.

Formula of true gray value = R*(TRUER [7:0]) + G*(TRUEG [7:0]) + B*(TRUEB [7:0])

Document

Sensor

ADF

Sensor

Document Sheet

Scanning Window

PSTFED

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