TMP88CU74F datasheet(32/132 Pages) TOSHIBA

32 / 132 page

TMP88CU74

2003-02-17

88CU74-32

The following method is used to save/restore the general-purpose registers.

General-purpose register save/restore by automatic register bank changeover

The general-purpose registers can be saved at high-speed by switching to a

and the banks 1 to 15 are assigned to interrupt service tasks. To increase the

efficiency of data memory utilization, the same bank is assigned for interrupt

sources which are not nested.

The switched bank is automatically restored by executing an interrupt return

instruction [RETI] or [RETN]. Therefore, it is not necessary for a program to save

the RBS.

Example: Register bank changeover

PINTxx:

Interrupt processing

RETI

VINTxx:

PINTxx

;

RBS

← RBS + 1

General-purpose register save/restore by register bank changeover

The general-purpose registers can be saved at high-speed by switching to a

and the banks 1 to 15 are assigned to interrupt service tasks.

Example: Register bank changeover

PINTxx:

RBS, n

Interrupt processing

RETI

;

Restores bank and Returns

VINTxx:

PINTxx

;

Interrupt service routine entry address

General-purpose registers save/restore using push and pop instructions

To save only a specific register, and when the same interrupt source occurs

more than once, the general-purpose registers can be saved/restored using the

push/pop instructions.

Example: Register save/restore using push and pop instructions

PINTxx:

PUSH

;

Save WA register pair

Interrupt processing

POP

;

Restore WA register pair

RETI

;

Return

2007-10-19

TMP88CU74F Datasheet(PDF) 32 Page - Toshiba Semiconductor

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