; KEYLCD-B.ASM ; Example program using the KEYPAD and LCD_PORT on the Axiom ; CMx12B32 boards. ; ; Memory Map Equates RAMSTRT: EQU $0800 ; start of internal ram MONRAM: EQU $0A00 ; monitor ram start RAMSIZE: EQU $0400 ; Size of internal ram REGBS: EQU $0000 ; start of registers ROMBS: EQU $FD80 ; start of initialization rom DSTREE: EQU $1000 ; start of eeprom DENDEE: EQU $1FFF ; end of eeprom STACK: EQU RAMSTRT+RAMSIZE ; top of stack MONSTRT: EQU $2000 ; start of this program if running under monitor PRGSTRT: EQU $8000 ; start of this program if running stand-alone #include equates.asm ; include register equates ; RAM ORG RAMSTRT CNT1 RMB 1 ; temporary count variable TMP1 RMB 1 ; temporary storage variable OLDKEY RMB 1 ; save key value for debounce ;********************** ; Program starts here * ;********************** ORG MONSTRT ; ORG PRGSTRT ; lds #STACK ; initialize stack pointer (don't do this if under monitor) START: jsr INITKEY ; Initialize KEYPAD jsr INITLCD ; Initialize LCD ldx #PMT ; get message string ;;;; jsr LCDSTR ; display string MainLoop: jsr GETKEY ; get a key from keypad, returned in A jsr LCDOUT ; display key value bra MainLoop ENDPROG: rts ; return (use this only if called, from monitor for example) jsr COP_RESET ; clear watch-dog timer bra ENDPROG ; endless loop ; The M68HC12A4 powers on with the COP (Computer Operating Properly) ; watchdog system enabled. If you don't reset it occasionally in your software ; it will reset you. This subroutine will reset the COP. COP_RESET: ldaa #$55 ; get 1st COP reset value staa COPRST ; store it ldaa #$AA ; get 2nd COP reset value staa COPRST ; store it rts ;************** ; TEXT TABLES * ;************** PMT: FCC 'Press Key: ',0 ; Include External Subroutine Files #include lcd12b.asm ; include 12B32 LCD functions #include key12b.asm ; include KEYPAD B32 functions END