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SPMCK16Z4MPV20 Datasheet(PDF) 480 Page - Freescale Semiconductor, Inc |
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SPMCK16Z4MPV20 Datasheet(HTML) 480 Page - Freescale Semiconductor, Inc |
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480 / 500 page  INITIALIZATION AND PROGRAMMING EXAMPLES M68HC16 Z SERIES E-28 USER’S MANUAL ANDA #$01 ;check only the TDRE flag bit BEQ SEND_CH ;if TDR is not empty, go back to check it again LDAA #$00 ;clear A to send a full word to SCDR ($FFC0E) STD SCDR ;transmit one ASCII character to the screen TC_LOOP: LDAB SCSR+1 ANDB #$80 ;test the TC bit (transfer complete) BEQ TC_LOOP ;continue to wait until TC is set RTS ;finish sending out byte ***** The STRINGS ***** STRING_IC1 DC.W 'Input capture 1 caught a transition',0a,0d,00 STRING_IC2 DC.W 'Input capture 2 caught a rising edge',0a,0d,00 STRING_IC3 DC.W 'Input capture 3 caught a falling edge',0a,0d,00 STRING_OC2 DC.W 0a,'Output compare 2 just toggled',0a,0d,00 STRING_PAOV DC.W 0a,'Pulse Accum. has overflowed 10 times!',07,0a,0d,00 ***** Exceptions/Interrupts ***** * Note that every one of the GPT interrupt service routines clears * its flag bit at the end of the routine before the RTI instruction. EVEN IC1_ROUTINE: ;execute when IC1 senses a transition LDX #STRING_IC1 JSR SEND_STRING ;print the message BCLR TFLG1,#$01 ;clear the IC1 flag bit RTI IC2_ROUTINE: ;execute when IC2 senses a rising edge LDX #STRING_IC2 JSR SEND_STRING ;print the message BCLR TFLG1,#$02 ;clear the IC2 flag bit RTI IC3_ROUTINE: ;execute when IC3 senses a falling edge LDX #STRING_IC3 JSR SEND_STRING ;print the message BCLR TFLG1,#$04 ;clear the IC3 flag bit RTI OC2_ROUTINE: ;execute when OC2 does a toggle LDX #STRING_OC2 JSR SEND_STRING ;print the message BCLR TFLG1,#$10 ;clear the OC2 flag bit RTI PAOV_ROUTINE: ;execute on Pulse Accumulator Counter overflow ;if PAI pin tied PWMA, bell approx every 5 sec ;if PAI pin tied PWMB, bell approx every 10 min Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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