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CHAPTER 21 ROM CORRECTION FUNCTION
21.1
Overview of the ROM Correction Function
An instruction code to be read by the CPU is replaced forcibly with an INT9 instruction
code (01
H
) when the corresponding address is equal to the value set in a program
address detect register. A program patch application function can be implemented by
processing with the INT #9 interrupt routine.
■
Program Address Detection Registers (
×
2)
There are two program address detection registers (PADR0/PADR1), each is provided with an interrupt
enable bit and interrupt flag.
■
ROM Correction Interrupts
When the interrupt enable bit is "1", the value set in the program address detection register is compared
with the address. If the value matches the address, "1" is set in the interrupt flag bit and the instruction code
to be read to the CPU, is forcibly replaced with an INT9 instruction code.
The interrupt flag bit is cleared to "0" by writing "0" to it using an instruction.
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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