Figure 21.5B Rom Correction Processing Example - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

21.5 Application Example
(6) INT9 interrupt
In the interrupt routine, the address that produces the interrupt can be known by checking the stack
program couter value. The information stacked during interrupt will be discarded.
ROM
RAM
296 Chapter 21: ROM Correction Module
FFFFFFh
(3)
Erroneous Program
(1)
Register setting
for ROM Correction
Corrected Program
(2)
000000h

Figure 21.5b ROM Correction Processing Example

MB90580
2
External E PROM
O Number of program byte
O Interrupt Trigger Address
O Corrected Program
Data sent via UART
MB90580 Series