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CHAPTER 7 INTERRUPT
7.4
Hardware Interrupt
The hardware interrupt function temporarily interrupts the program being executed by
the CPU and transfers control to a user-defined interrupt processing program in
response to an interrupt signal from a peripheral function.
The extended intelligent I/O service (EI
2
OS) and external interrupt are executed as a
type of hardware interrupt.
■
Hardware Interrupt
●
Hardware interrupt function
The hardware interrupt function compares the interrupt level of the interrupt request signal output by a
peripheral function with the interrupt level mask register (ILM) in the CPU processor status (PS). The
function then references the contents of the I flag in the processor status (PS) through the hardware and
decides if the interrupt can be accepted.
When the hardware interrupt is accepted, the CPU internal registers are automatically saved on the system
stack. The currently requested interrupt level is stored in the interrupt level mask register (ILM), and the
function branches to the corresponding interrupt vector.
●
Multiple interrupts
Multiple hardware interrupts can be activated.
●
Extended intelligent I/O service (EI
2
OS)
EI
2
OS is an automatic transfer function between memory and I/O. When the specified transfer count has
been completed, a hardware interrupt is activated. Multiple EI
2
OS activation does not occur. During
EI
2
OS processing, all other interrupt requests and EI
2
OS requests are held.
●
External interrupt
An external interrupt (including wake-up interrupt) is accepted from a peripheral function (interrupt request
detection circuit) as a hardware interrupt.
●
Interrupt vector
Interrupt vector tables referenced during interrupt processing are allocated to memory at FFFC00
H
to
FFFFFF
H
. These tables are shared by software interrupts.
See "7.2 Interrupt Causes and Interrupt Vectors", for more information about the allocation of interrupt
numbers and interrupt vectors.
Содержание MB90460 Series
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Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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