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CHAPTER 21 ADDRESS MATCH DETECTION FUNCTION
21.4 Explanation of Operation of Address Match Detection Function
■ Setting and Operating State
●
Initialization
2
• E
PROM data are all cleared to "00
●
Occurrence of program error
• By using the connector (UART), information about the patch program is transmitted to the MCU
(MB90335 series) from the outside according to the allocation of the E
• The MCU (MB90335 series) stores the information received from outside in the E
●
Reset sequence
• After reset, the MCU (MB90335 series) reads the byte count of the E
the presence or absence of the correction program.
• If the byte count of the patch program is not "00
0 and 1 are read and set in the Program address detection registers 0 and 1 (PADR0, PADR1). The patch
program (main body) is read according to the byte count of the patch program and written to RAM in
the MCU (MB90335 series).
• The patch program (main body) is allocated to the address where the patch program is executed in the
INT9 interrupt processing by the address match detection function.
• Address match detection is enabled (PACSR: AD0E = 1, AD1E = 1)
●
INT9 Interrupt processing
• Interrupt processing is performed by the INT9 instruction. The MB90335 series has no interrupt request
flag by address match detection. Therefore, if the stack information in the program counter is discarded,
the detect address cannot be checked. When checking the detect address, check the value of program
counter stacked in the interrupt processing routine.
• The patch program is executed, branching to the normal program.
470
".
H
FUJITSU MICROELECTRONICS LIMITED
2
PROM patch program and data.
2
PROM patch program to check
", the higher, middle and lower bits at detect addresses
H
MB90335 Series
2
PROM.
CM44-10137-6E
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