68
CHAPTER 3 INTERRUPTS
3.5.3
Multiple interrupts
As a special case, no hardware interrupt request can be accepted while data is being
written to the I/O area. For MB90390 Series, this includes the address ranges "00
H
" to
"BF
H
", ("3100
H
" to "31FF
H
", "3300
H
" to "33FF
H
",) "3500
H
" to "35FF
H
", "3700
H
" to
"37FF
H
", "3900
H
" to "39FF
H
", "3B00
H
" to "3BFF
H
", "3D00
H
" to "3DFF
H
" and "3F00
H
" to
"3FFF
H
". This is intended to prevent the CPU from operating falsely because of an
interrupt request issued while an interrupt control register for a resource is being
updated. If an interrupt occurs during interrupt processing, a higher-level interrupt is
processed first.
■
Multiple Interrupts
The F
2
MC-16LX CPU supports multiple interrupts. If an interrupt of a higher level occurs while another
interrupt is being processed, control is transferred to the high-level interrupt after the currently executing
instruction is completed. After processing of the high-level interrupt is completed, the original interrupt
processing is resumed. An interrupt of the same or lower level may be generated while another interrupt is
being processed. If this happens, the new interrupt request is suspended until the current interrupt
processing is completed, unless the ILM value or I flag is changed by an instruction.
The extended intelligent I/O service cannot be activated from multiple sources; while an extended
intelligent I/O service is being processed, all other interrupt requests or extended intelligent I/O service
requests are suspended.
Figure 3.5-2 shows the order of the registers saved in the stack.
Figure 3.5-2 Registers Saved in Stack
"H"
"L"
MSB
LSB
AH
AL
PC
PS
ADB
PCB
DTB
DPR
Word (16 bits)
SSP (SSP value before interrupt)
SSP (SSP value after interrupt)
Содержание MB90390 Series
Страница 2: ......
Страница 4: ......
Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
Страница 18: ...xiv ...
Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
Страница 722: ...694 APPENDIX ...
Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
Страница 740: ......