10
10-38
Ver.0.10
MULTIJUNCTION TIMERS
10.2 Common Units of Multijunction Timer
For interrupts which have two or more sources of interrupt in one interrupt table, interrupt control
registers are provided, with which to control interrupt requests and determine interrupt input.
Therefore, the status flags in the interrupt controller function only as a bit to show whether an
interrupt-enabled interrupt request occurred and cannot be written to.
(1) Interrupt request status bit
This status bit shows whether an interrupt request occurred. When an interrupt request is
generated, this bit is set in hardware (but cannot be set in software). The status bit is cleared by
writing a 0, but not affected by writing a 1, in which case the bit holds the status intact. Because
the status bit is unaffected by interrupt mask bits, it can also be used to check the operation of
peripheral function. In interrupt processing, make sure that among grouped interrupt flags, only
the flag for the serviced interrupt is cleared. Clearing flags for unserviced interrupts results in the
pending interrupt requests also being cleared.
(2) Interrupt mask bit
This bit is used to disable unnecessary interrupts among grouped interrupt requests. Set this bit
to 0 to enable interrupts or 1 to disable interrupts.
Figure 10.2.5 Interrupt Status Register and Mask Register
Interrupt
controller
Each timer or TIN input
interrupt request
Interrupt status
Data bus
Set
Group interrupt
Interrupt enable
clear
F/F
F/F
Data = 0
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...