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SPMCK16Z4MPV20 Datasheet(PDF) 469 Page - Freescale Semiconductor, Inc |
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SPMCK16Z4MPV20 Datasheet(HTML) 469 Page - Freescale Semiconductor, Inc |
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469 / 500 page  M68HC16 Z SERIES INITIALIZATION AND PROGRAMMING EXAMPLES USER’S MANUAL E-17 STD SCCR1 ;enable SCI receiver and transmitter LDAB #$01 TBZK ;point ZK at bank 1 (the SRAM) LDZ #$0000 ;for indexing the variables CNT and DLY CNT EQU $0000 ;loop counter DLY EQU $0002 ;delay counter ***** Main Program ***** MAIN: LDAB #$7F ;set clock speed to 16.777MHz STAB SYNCR ;w=0, x=1, y=111111 NOT_L: BRCLR SYNCR+1,#8,NOT_L ;wait until synthesizer lock bit is set LDD #$01B5 STD SCCR0 ;set baud rate to 1200 JSR DELAY ;delay for modulus counter of SCI to flush LDX #STRING ;load address of string into IX JSR SEND_STRING ;subroutine to send string to dummy terminal LDAB #$05 ;set up loop counter STAB CNT,Z LOOP1: LDX #SEC_STR ;load address of string into IX JSR SEND_STRING ;subroutine to send string to dummy terminal DEC CNT,Z ;decrement loop counter BNE LOOP1 ;loop 5 times LDAB #$4F ;change clock frequency to 4.194MHz STAB SYNCR ;w=0, x=1, y=001111 LOOP2: BRCLR SYNCR+1,#8,LOOP2 ;wait until synthesizer lock bit is set LDD #$006D STD SCCR0 ;set BAUD rate back to 1200 JSR DELAY ;delay for modulus counter of SCI to flush LDX #STRING2 ;load address of string into IX JSR SEND_STRING ;subroutine to send string to dummy terminal LDAB #$05 ;set up # of loops for loop counter to 5 STAB CNT,Z LOOP3: LDX #SEC_STR ;load address of string into IX JSR SEND_STRING ;subroutine to send string to dummy terminal DEC CNT,Z ;decrement loop counter BNE LOOP3 ;loop 5 times LBRA MAIN ;branch back to main ***** Subroutines ***** DELAY: LDD #$FFFF ;delay loop STD DLY,Z LOOP4: DEC DLY,Z BNE LOOP4 RTS SEND_STRING: ;subroutine to send out the entire ASCII ;string LDAB 0,X ;get next byte in string as pointed to by IX BEQ STRING_DONE ;if B=00, then message is done Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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