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GL843 Datasheet(PDF) 79 Page - GENESYS LOGIC |
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GL843 Datasheet(HTML) 79 Page - GENESYS LOGIC |
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79 / 84 page  GL843 High Speed USB2.0 With ADF 2-in-1 Scanner Controller For 3x ©2000-2006 Genesys Logic Inc. - All rights reserved. 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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