TMP89FS60 Datasheet, PDF (73/410 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

TMP89FS60
Main task
Interrupt acceptance
Interrupt
service task
The register bank
BANK0 is in use.
LD (RBS),1
Switching occurs to
the register bank BANK1.
Interrupt return
A return is made automatically to
the register bank BANK0.
Figure 3-5 Saving/Restoring General-purpose Registers under Interrupt Processing
3.5.4 Interrupt return
Interrupt return instructions [RETI]/[RETN] perform as follows.
[RETI]/[RETN] Interrupt Return
1. Program counter (PC) and program status word (register bank) are
restored from tha stack.
2. Stack pointer (SP) is incremented by 3.
RA003
Page 59