tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 72
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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3.5 Interrupt Sequence
3. Interrupt Control Circuit
RA003
Example :Save/store register using data transfer instructions
Example :Saving/restoring registers, using an instruction for transfer with data memory (with the main task using the regis-
Figure 3-4 Saving/Restoring General-purpose Registers under Interrupt Processing
3.5.3.2
3.5.3.3
ter bank BANK0)
PINTxx:
PINTxx:
purpose registers at a time. The register bank function saves (switches) the general-purpose registers by
executing a register bank manipulation instruction (such as LD RBS,1) at the beginning of an interrupt
service task. It is unnecessary to re-execute the register bank manipulation instruction at the end of the
interrupt service task because executing the RETI instruction makes a return automatically to the register
bank that was being used by the main task according to the content of the PSW.
Using data transfer instructions
Using a register bank to save/restore general-purpose registers
To save only a specific register without nested interrupts, data transfer instructions are available.
In non-multiple interrupt handling, the register bank function can be used to save/restore the general-
Note: Two register banks (BANK0 and BANK1) are available. Each bank consists of 8-bit general-purpose
registers (W, A, B, C, D, E, H, and L) and 16-bit general-purpose registers (IX and IY).
LD
Interrupt processing
LD
RETI
LD
Interrupt processing
RETI
Main task
Interrupt acceptance Interrupt
Interrupt return
(GSAVA), A
A, (GSAVA)
RBS, 1
Page 58
service task
; Save A register
; Restore A register
; RETURN
; Switches to the register bank BANK1
; RETURN
(Makes a return automatically to BANK0 that
was being used by the main task when the
PSW is restored)
Saving
registers
Restoring
registers
TMP89FM42
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