User's Manual 686LCD/S & 686LCD/MG CPU Board

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686LCD/S & 686LCD/MG CPU Board - Version 1.4.0 - 8. December 1997 4.7 INSIDE Interrupts The interrupt number is selected in the INSIDE Utilities setup menu. By loading the desired function number in the AL CPU register and generating a software interrupt with the INT X instruction the function is called. X is the interrupt number specified in the Inside utility setup. Some of the functions will require an additional value loaded in the AH register. The software interrupt is used to control the following: Function 00h, Diagnostic call. This call can be used to test whether the interrupt is setup correct. Input : AL = Output : AL = 00h 5Ah Function 10h, Enable displays. This call enables or disables the CRT and Flat panel outputs. Input : AL = AH = 10h 00h : Disable both CRT and Flat panel outputs. 01h : Enable CRT and disable Flat panel output. 02h : Disable CRT and enable Flat panel output. 03h : Enable both CRT and Flat panel outputs. Function 20h, Write to general purpose digital outputs. This function is used to access the general purpose pins GPIO7..0 in the JPFEAT connector. Input : AL = AH = 20h The port value to be written. GPIO0 in bit 0 of AH. Function 21h, Read back from general purpose digital outputs. This function is used to read back values directly on the GPIO pins. Input : AL = Output : AH = 21h The read port value. GPIO0 in bit 0 of AH. Function 22h, Same as function 21h for compatibility reasons. INSIDE Technology A/S. Page 28 of 134
686LCD/S & 686LCD/MG CPU Board - Version 1.4.0 - 8. December 1997 Function 23h, Setup GPIO’s This function allows the user to control the definitions on the GPIO pins, could be used in e.g. a multidrop application. The states are only changed dynamically, when booting next time the definition will be overwritten by the CMOS setup values. Input : AL = AH = 23h Port definition, GPIO0 in bit 0 of AH, where 1’s present an input state. Function 30h, Set the default display contrast. Sets the default contrast level for the connected LCD panel. This feature is useful only if the Flat Panel Utility Module (FPUM) is present. Input : AL = AH = 30h 8 bits value. 00h is lowest contrast, 0FFh highest. Function 31h, Read the default display contrast. This function reads the previous contrast value written by function 30h. This feature is useful only if the Flat Panel Utility Module (FPUM) is present. Input : AL = Output : AH = 31h The value read. Function 32h, Turn on backlight. This feature is useful only if the Flat Panel Utility Module (FPUM) is present. Input : AL = 32h Function 33h, Turn off backlight. This feature is useful only if the Flat Panel Utility Module (FPUM) is present. Input : AL = 33h INSIDE Technology A/S. Page 29 of 134
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User's Manual 686LCD/S & 686LCD/MG CPU Board

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