5
5-8
Ver.0.10
5.3.2 Interrupt Mask Register
■
Interrupt Mask Register (IMASK)
<Address:H'0080 0004>
The Interrupt Mask Register (IMASK) is used to finally determine whether an interrupt request
can be accepted after comparing its priority with the priority levels that have been set for each
interrupt source (by setting the Interrupt Control Register ILEVEL bits). When the Interrupt Vector
Register (IVECT) described above is read out, a new mask value (NEW_IMASK) is set in this
IMASK register.
When any value is written to the IMASK register, operations (1) to (2) below are automatically
performed in hardware:
(1) The interrupt request (EI) to the CPU core is cleared.
(2) The ICU's internal sequencer is activated to start internal processing (interrupt priority
resolution).
Note that the Interrupt Mask Register (IMASK) can only be read out by the EIT handler (PSW
register IE bit being disabled).
<When reset: H''07>
D
Bit Name
Function
R
W
0 – 4
No functions assigned
0
–
5– 7
IMASK (Interrupt mask)
000 : Maskable interrupts are disabled
001 : Level 0 interrupts can be accepted
010 : Level 0-1 interrupts can be accepted
011 : Level 0-2 interrupts can be accepted
100 : Level 0-3 interrupts can be accepted
101 : Level 0-4 interrupts can be accepted
110 : Level 0-5 interrupts can be accepted
111 : Level 0-6 interrupts can be accepted
D0
1
2
3
4
5
6
D7
IMASK
INTERRUPT CONTROLLER (ICU)
5.3 ICU-Related Registers
CAUTION
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 ...