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AN1447 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN1447 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 26 page 9/26 4-MULTIPLEXED LCD WITH A STANDARD ST62 Figure 7. Template for MCU – LCD connections 2.1.2 Driver subroutines and variables The main application communicates with the LCD driver through six 8-bit variables and 3 sub- routines, all declared in LCD_drv.inc. The six variables are written by the main application and read by the software LCD driver. They describe the information that should be displayed: – hr_dig1, hr_dig0, min_dig1 and min_dig0 contain the code of the character to be dis- played on each 7-segment digit; – icons is a byte of flags indicating, for each icon, if it must be ON or OFF; – flashing is a byte of flags indicating, for each 7-segment digit and each icon, if it must be flashing or not. pin3 pin2 pin1 pin0 commons port Vdd ST62 pin3 pin0 pin1 pin2 pin4 pin5 pin6 pin7 segments port COM3 COM2 COM1 COM0 S0 S1 S2 S3 S4 S5 S6 S7 LCD 470k resistors AM PM °C |
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