CHAPTER 7 INTERRUPT/EXCEPTION PROCESSING FUNCTION
User’s Manual U12688EJ4V0UM00
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Figure 7-5. Maskable Interrupt Processing
INT input
xxIF=1
No
Interrupt request?
xxMK=0
No
Is the interrupt
mask released?
Yes
Yes
No
No
No
Maskable interrupt request
Interrupt request pending
PSW.NP
PSW.ID
1
1
Interrupt request pending
0
0
Interrupt processing
CPU processing
INTC acknowledgement
Yes
Yes
Yes
Priority higher than
that of interrupt currently being
processed?
Priority higher
than that of other interrupt
request?
Highest default
priority of interrupt requests
with the same priority?
EIPC
EIPSW
ECR. EICC
PSW. EP
PSW. ID
PC
restored PC
PSW
exception code
0
1
handler address
The INT input masked by the interrupt controllers and the INT input that occurs while another interrupt is being
processed (when PSW.NP = 1 or PSW.ID = 1) are held pending internally by the interrupt controller. When the
interrupts are unmasked, or when PSW.NP = 0 and PSW.ID = 0 are set by the RETI and LDSR instructions, input of
the pending INT starts the new maskable interrupt processing.
Summary of Contents for V850E/MS1 UPD703100
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