Fujitsu FR81S User Manual
CHAPTER 49: BUS DIAGNOSIS FUNCTION
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : BUS DIAGNOSIS FUNCTION
FUJITSU SEMICONDUCTOR CONFIDENTIAL
21
NMI request generation/stop
NMI request is continued while either error (each bus of address error (AER[3:0]), control error (CNER) or
data error (DER)) has been detected.
NMI request is discontinued when all error (each bus of address error (AER[3:0]), control error (CNER)
and data error (DER)) are cleared.
Note:
BUS diagnostic function generates NMI interrupt upon detecting of bus error. NMI is an interrupt that
cannot be masked (i.e., cannot be suppressed).
On software side, you must always configure an NMI process routine. If NMI process routine is undefined,
and if bus failure occurs, program execution goes runaway after NMI is generated.
MB91520 Series
MN705-00010-1v0-E
2114