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CHAPTER 7 INTERRUPT
■
Hardware Interrupt Structure
Table 7.4-1 lists four mechanisms used for hardware interrupt. These four mechanisms must be included in
the program before hardware interrupt can be used.
These four mechanisms must be included in the program before hardware interrupt can be used.
■
Hardware Interrupt Suppression
Acceptance of hardware interrupt requests is suppressed under the following conditions.
●
Hardware interrupt suppression during writing to the peripheral function control register area
When data is being written to the peripheral function control register area, hardware interrupt requests are
not accepted. This prevents the CPU from making operational mistakes. The mistakes may be caused if an
interrupt request is generated during data is written to the interrupt control registers for a resource. The
peripheral function control register area is not the I/O addressing area at 000000
H
to 0000FF
H
, but the area
allocated to the control register of the peripheral function control register and data register.
Figure 7.4-1 shows hardware interrupt operation during writing to the built-in resource area.
Figure 7.4-1 Hardware Interrupt Request while writing to the Peripheral Function Control Register Area
Table 7.4-1 Mechanisms used for Hardware Interrupt
Mechanism
Function
Peripheral function
Interrupt enable bit, interrupt
request bit
Controls interrupt requests from a peripheral
function
Interrupt controller
Interrupt control register (ICR)
Sets the interrupt level and controls EI
2
OS
CPU
Interrupt enable flag (I)
Identifies the interrupt enable status
Interrupt level mask register
(ILM)
Compares the request interrupt level and
current interrupt level
Microcode
Executes the interrupt processing routine
FFFC00
H
to
FFFFFF
H
in memory
Interrupt vector table
Stores the branch destination address for
interrupt processing
MOV A, #08
MOV io, A
MOV A, 2000H
Interrupt processing
An interrupt request
is generated here
Does not branch
to the interrupt
Branches to
the interrupt
Instruction that writes to the peripheral function control register area
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 ...
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Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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