tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 73

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA003
3.5.4 Interrupt return
Figure 3-5 Saving/Restoring General-purpose Registers under Interrupt Processing
Interrupt return instructions [RETI]/[RETN] perform as follows.
The register bank
BANK0 is in use.
Main task
1. Program counter (PC) and program status word (register bank) are
restored from tha stack.
2. Stack pointer (SP) is incremented by 3.
Interrupt acceptance
A return is made automatically to
the register bank BANK0.
Interrupt return
[RETI]/[RETN] Interrupt Return
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Interrupt
service task
LD (RBS),1
Switching occurs to
the register bank BANK1.
TMP89FM42