gl845 Genesys Logic, gl845 Datasheet - Page 89

• Manufacturer Part Number: gl845
• Description: High Speed Usb 2.0 2-in-1 Scanner Controller With Adf
• Manufacturer: Genesys Logic

26 GPIO Ports
Designers can separately assign input or output direction for each GPIO pin of GPIO1~21 and GPIO27. Some
GPIO can be designed for keypads, document sensor of sheetfed or motor power control…etc.
Designers can assign GPIO27 as general-purpose input/output port or as ADF sensor input.
Note : There are four pins for special function.
27 GPO28~33 Ports
GL845 provides 6 ports for general-purpose output. They exist in both 128 and 208 pins packages.
28 Power on Check
The default status of the PWRBIT control bit is reset. Programmers can set the PWRBIT control bit before
controlling the ASIC. GL845 will keep the status until power is turn off. This operation is to check if the
power had been turned off or not.
29 Extended GPIO
GPIO22~26 is only available in 208 pins QFP package.
30 LED Blinking
GL845 supports LED -blinking function. It is implemented in GPIO15~16 pins and GPIO21~26.
31 Support Back Scanning
GL845 supports forward or backward scanning.
32 Support LCD Interface
GL845 supports LCD display interface via internal logic circuitry. Programmers need to set the LCDSEL
control bit to logic ‘1’. GPIO29 controls COM1 of LCD. GPIO30 controls COM2 of LCD. GPIO18 controls
SCK of external 74HC595. GPIO19 controls SI of external 74HC595. GPIO20 controls RCK of external
74HC595.
The 74HC595 is a shift register of series-in & parallel-out to generate S1~7 data of LCD.
Following is the application of keys matrix & LCD display.
©2000-2007 Genesys Logic Inc. - All rights reserved.
GPIO9: This pin can control bipolar motor driver IC (2916,6219,3955 or 3967) Vref3 for control
GPIO13: This pin can control bipolar motor driver IC (2916,6219,3955 or 3967) Vref2 for control
GPIO12: 1. Pull up by resistor to indicate ASIC to turn on lamp power in power-on initial state.
GPIO11: This pin can control bipolar motor driver IC (2916,6219,3955 or 3967) Vref0 for control
Imax current.
2. Pull down by resistor to indicate ASIC to turn off lamp power in power-on initial state..
3. This pin can control bipolar motor driver IC (2916,6219,3955 or 3967) Vref1 for controlling
Imax current.
Imax current.
GL845 High Speed USB2.0 2-in-1 Scanner Controller With ADF
Imax current.
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