tmp89ch42 TOSHIBA Semiconductor CORPORATION, tmp89ch42 Datasheet - Page 72
tmp89ch42
Manufacturer Part Number
tmp89ch42
Description
8 Bit Microcontroller Tlcs-870/c1 Series
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89CH42.pdf
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3.5
Interrupt Sequence
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
Page 58
Interrupt
service task
LD (RBS),1
Switching occurs to
the register bank BANK1.
TMP89CH42
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