Rev. 1.0, 02/00, page 539 of 1141
3. When condition is not satisfied by Bcc instruction (16-bit displacement)
If the trap address is the next instruction to the Bcc instruction and the condition is not satisfied
by the Bcc instruction and thus it fails to branch, transition is made to the address trap interrupt
after executing the trap address instruction (if the trap address instruction is that of 2 states or
more. If the instruction is that of 1 state, after executing two instructions). The address to be
stacked is 02C0.
φ
Address bus
Interrupt
request
signal
Start of
exception handling
02B8
02C0
02BC 02BE
02C2
02BA
02B8 BEQ NEXT:16
02BC NOP
02BE NOP
02C0 NOP
02C2 NOP
02C4 NOP
(NEXT = H'02C4)
*
BEQ
execution
NOP
execu-
tion
NOP
execu-
tion
Data
fetch
Internal
opera-
tion
BEQ
instruc-
tion
pre-fetch
NOP
instruc-
tion
pre-fetch
NOP
instruc-
tion
pre-fetch
NOP
instruc-
tion
pre-fetch
NEXT:
Note:
*
Trap setting address
The underlines address is the one to be actually stacked.
Figure 25.8 When the Condition Not Satisfied by Bcc Instruction (16-bit Displacement)