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CHAPTER 17 DTP/EXTERNAL INTERRUPTS
17.5
Precautions when Using DTP/External Interrupt
This section explains the precautions when using the DTP/external interrupt.
■
Precautions when Using DTP/External Interrupt
●
Condition of external-connected peripheral device when DTP function is used
•
When using the DTP function, the peripheral device must automatically clear a data transfer request
when data transfer is performed.
•
Inactivate the transfer request signal within three machine clocks after starting data transfer. If the
transfer request signal remains active, the DTP/external interrupt regards the transfer request signal as a
generation of next transfer request.
●
External interrupt input polarity
•
When the edge detection is set in the detection level setting register, the pulse width for edge detection
must be at least three machine clocks.
•
When a level causing an interrupt factor is inputted with level detection set in the detection level setting
register, factor F/F in the DTP/external interrupt factor register is set to "1" and the factor is held as
shown in Figure 17.5-1 .
With the factor held in factor F/F, the request to the interrupt controller remains active if the interrupt
request is enabled (ENIR1: EN = 1) even after the DTP/external interrupt factor is cancelled. To cancel the
request to the interrupt controller, clear the external interrupt request flag bit (EIRR1: ER) and clear the
factor F/F as shown in Figure 17.5-2 .
Figure 17.5-1 Clearing Factor Hold Circuit when Level Set
Figure 17.5-2 DTP/External Interrupt Factor and Interrupt Request Generated when Interrupt Request
Enabled
DTP/ interrupt
input detection
circuit
DTP/external
interrupt factor
Factor F/F
(EIRR1 register)
Enable gate
To interrupt
controller
(interrupt request)
The factor remains held unless cleared.
DTP/external interrupt factor
(when High level detected)
Interrupt request issued
to interrupt controller
The interrupt request is inactived by clearing the factor F/F.
Interrupt factor cancelled
Summary of Contents for F2MCTM-16LX
Page 2: ......
Page 3: ...FUJITSU LIMITED F2MCTM 16LX 16 BIT MICROCONTROLLER MB90360 Series HARDWARE MANUAL ...
Page 4: ......
Page 42: ...26 CHAPTER 1 OVERVIEW ...
Page 70: ...54 CHAPTER 2 CPU ...
Page 134: ...118 CHAPTER 6 CLOCK SUPERVISOR ...
Page 176: ...160 CHAPTER 8 LOW POWER CONSUMPTION MODE ...
Page 194: ...178 CHAPTER 10 I O PORTS ...
Page 252: ...236 CHAPTER 13 16 Bit I O TIMER ...
Page 282: ...266 CHAPTER 14 16 BIT RELOAD TIMER ...
Page 296: ...280 CHAPTER 15 WATCH TIMER ...
Page 386: ...370 CHAPTER 18 8 10 BIT A D CONVERTER ...
Page 426: ...410 CHAPTER 20 LIN UART Figure 20 5 2 ORE Flag Set Timing RDRF ORE Reception data ...
Page 540: ...524 CHAPTER 22 ADDRESS MATCH DETECTION FUNCTION ...
Page 568: ...552 CHAPTER 24 512K BIT FLASH MEMORY ...
Page 633: ...617 APPENDIX B Instructions Table B 9 3 Bit Operation Instruction Map first byte 6CH ...
Page 634: ...618 APPENDIX Table B 9 4 Character String Operation Instruction Map first byte 6EH ...
Page 637: ...621 APPENDIX B Instructions Table B 9 7 ea Instruction 2 first byte 71H ...
Page 638: ...622 APPENDIX Table B 9 8 ea Instruction 3 first byte 72H ...
Page 639: ...623 APPENDIX B Instructions Table B 9 9 ea Instruction 4 first byte 73H ...
Page 640: ...624 APPENDIX Table B 9 10 ea Instruction 5 first byte 74H ...
Page 641: ...625 APPENDIX B Instructions Table B 9 11 ea Instruction 6 first byte 75H ...
Page 642: ...626 APPENDIX Table B 9 12 ea Instruction 7 first byte 76H ...
Page 643: ...627 APPENDIX B Instructions Table B 9 13 ea Instruction 8 first byte 77H ...
Page 644: ...628 APPENDIX Table B 9 14 ea Instruction 9 first byte 78H ...
Page 645: ...629 APPENDIX B Instructions Table B 9 15 MOVEA RWi ea Instruction first byte 79H ...
Page 646: ...630 APPENDIX Table B 9 16 MOV Ri ea Instruction first byte 7AH ...
Page 647: ...631 APPENDIX B Instructions Table B 9 17 MOVW RWi ea Instruction first byte 7BH ...
Page 648: ...632 APPENDIX Table B 9 18 MOV Ri ea Instruction first byte 7CH ...
Page 649: ...633 APPENDIX B Instructions Table B 9 19 MOVW ea Rwi Instruction first byte 7DH ...
Page 650: ...634 APPENDIX Table B 9 20 XCH Ri ea Instruction first byte 7EH ...
Page 651: ...635 APPENDIX B Instructions Table B 9 21 XCHW RWi ea Instruction first byte 7FH ...
Page 664: ...648 APPENDIX ...
Page 665: ...649 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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