HCS12 datasheet(144/452 Pages) FREESCALE

144 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

144

Freescale Semiconductor

Operation:

(SP) – $0002

⇒ SP; RTNH : RTNL ⇒ M(SP) : M(SP+1)

(SP) – $0001

⇒ SP; (PPAGE) ⇒ M(SP)

page

⇒ PPAGE; Subroutine Address ⇒ PC

Description:

Sets up conditions to return to normal program flow, then transfers control

to a subroutine in expanded memory. Uses the address of the instruction

following the CALL as a return address. For code compatibility, CALL also

executes correctly in devices that do not have expanded memory capability.

Decrements the SP by two, then stores the return address on the stack. The

SP points to the high-order byte of the return address.

Decrements the SP by one, then stacks the current memory page value

from the PPAGE register on the stack.

Writes a new page value supplied by the instruction to PPAGE and transfers

control to the subroutine.

In indexed-indirect modes, the subroutine address and the PPAGE value

are fetched from memory in the order M high byte, M low byte, and new

PPAGE value.

Expanded-memory subroutines must be terminated by an RTC instruction,

which restores the return address and PPAGE value from the stack.

CALL

Call Subroutine in Expanded Memory

CALL

CCR Details:

HIN

––––––––

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

CALL opr16a, page

CALL oprx0_xysp, page

CALL oprx9,xysp, page

CALL oprx16,xysp, page

CALL [D,xysp]

CALL [oprx16,xysp]

EXT

IDX

IDX1

IDX2

[D,IDX]

[IDX2]

4A hh ll pg

4B xb pg

4B xb ff pg

4B xb ee ff pg

4B xb

4B xb ee ff

gnSsPPP

fgnSsPPP

fIignSsPPP

gnfSsPPP

fgnfSsPPP

fIignSsPPP

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