GMS30004 datasheet(37/158 Pages) HYNIX

37 / 158 page

3 - 10

(16) CAL a

Naming :

Subroutine Call on status 1

Status :

Conditional depending on the status

Format :

Operand :

Subroutine code address a(Addr)

Function :

When ST =1 , PC

à a(Addr)

à PB

SR1

à PC + 1,

PSR1

à PA

SR2

à SR1

PSR2

à PSR1

SR3

à SR2

PSR3

à PSR2

When ST = 0 PC

à PC + 1

à PS

à 1

Note : PC actually has pseudo-random count against the next

instruction.

• In a program, control is allowed to be transferred to a mutual

subroutine. Since a call instruction preserves the return

address, it is possible to call the subroutine from different

locations in a program, and the subroutine can return control

accurately to the address that is preserved by the use of the

call return instruction (RTN).

Such calling is always conditional depending on the status.

a. If the status is reset, call is not executed.

b. If the status is set, call is rightly executed.

The subroutine stack (SR) of three levels enables a subroutine to

be manipulated on three levels. Besides, a long call (to call

another page) can be executed on any level.

• For a long call, an LPBI instruction should be executed before

the CAL. When LPBI is omitted (and when PA=PB), a short

call (calling in the same page) is executed.

Chapter 3. Instruction

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