tmp89fm42a TOSHIBA Semiconductor CORPORATION, tmp89fm42a Datasheet - Page 86

• Manufacturer Part Number: tmp89fm42a
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA003
3.5.4
Figure 3-5 Saving/Restoring General-purpose Registers under Interrupt Processing
Interrupt return
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 re-
stored 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.
TMP89FM42A