GL843 datasheet(77/84 Pages) GENESYS

77 / 84 page

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

Page 77

3. This pin can control bipolar motor driver IC (2916,6219,3955 or 3967) Vref for controlling

Imax current.

GPIO11: This pin can control bipolar motor driver IC (2916,6219,3955 or 3967) Vref for control

Imax current.

27 GPO28~33 Ports

GL843 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. GL843 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

GPIO21~26 is only available in 208 pins QFP package.

30 LED Blinking

GL843 supports LED -blinking function. It is implemented in GPIO15~16 pins and GPIO21~26.

31 Support Back Scanning

GL843 supports forward or backward scanning.

32 Support LCD Interface

GL843 supports LCD display interface via internal logic circuitry. Programmers need to set the LCDSEL

control bit to logic ‘1’.

33 Support LCM Interface

GL843 supports LCM display interface via internal logic circuitry. Programmers need to set the LCMSEL

control bit to logic ‘1’. GPIO19 controls RS of LCM. GPIO20 controls EN of LCM.

GPIO1~4 control the data bus of LCM and share the input of keys matrix. GPIO18 controls the /E of external

74HC244.

The 74HC244 is a bus buffer to share keys matrix and LCM data bus.

Following is the application of keys matrix & LCM display.

GL843 Datasheet(PDF) 77 Page - GENESYS LOGIC