Panasonic MN103001G/F01K - Manual (Page 216)

Interrupt Controller
9-28
Interrupt accepted group register
Register symbol: IAGR
Address: x'34000200
Purpose: This register is used to read the group number that generated the interrupt request.
Bit No. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit
- - - - - - - - - GN4 GN3 GN2 GN1 GN0 - -
name
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Access R R R R R R R R R R R R R R R R
Bit No. Bit name Description
6 to 2 GN4 to 0 Group number register
The group number that was accepted is stored in GN 4 to 0.
During a register read, this register returns the smallest group number of the groups that are generating an interrupt
of the interrupt levels indicated by IM2 to 0 the PSW.
Because when an interrupt generated, the interrupt levels accepted by the CPU are set in IM2 to 0, this register
returns a group number that is generating an interrupt level accepted by the CPU. However, if IM2 to 0 are
changed, if the interrupt control register is manipulated, or if a new interrupt factor is generated, the value that this
register returns may change even while interrupt processing is in progress.
The interrupt accepted group register IAGR is a read-only register; it cannot be written.