tmp86c809ng TOSHIBA Semiconductor CORPORATION, tmp86c809ng Datasheet - Page 49

• Manufacturer Part Number: tmp86c809ng
• Description: 8 Bit Microcontroller Tlcs-870/c Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Example :Save/store register using PUSH and POP instructions
Example :Save/store register using data transfer instructions
Figure 3-2 Saving/Restoring General-purpose Registers under Interrupt Processing
3.4.2.2
SP
At acceptance of
an interrupt
PINTxx:
PINTxx:
Using data transfer instructions
To save only a specific register without nested interrupts, data transfer instructions are available.
PSW
PCH
PCL
Saving/Restoring general-purpose registers using PUSH/POP data transfer instruction
PUSH
(interrupt processing)
POP
RETI
LD
(interrupt processing)
LD
RETI
SP
Main task
At execution of
PUSH instruction
WA
WA
(GSAVA), A
A, (GSAVA)
PSW
PCH
PCL
W
A
Interrupt
acceptance
Interrupt return
Page 39
SP
Interrupt
service task
At execution of
POP instruction
; Save WA register
; Restore A register
; Restore WA register
; RETURN
; Save A register
; RETURN
PSW
PCL
PCH
Saving
registers
Restoring
registers
SP
At execution of
RETI instruction
TMP86C809NG
Address
(Example)
b-5
b-4
b-3
b-2
b-1
b