Freescale-semiconductor StarCore SC140 Manuel d'utilisateur télécharger pdf (Page 99)

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101

Memory Interface

SC140 DSP Core Reference Manual 2-67

Table 2-28 shows the representation of the stack support instructions in big and little endian modes. In the

examples shown in this table, it is assumed that the stack access is to address A0. The stack instructions

treat the register data like a 32-bit long word move.

Table 2-29 shows the representation of the bit mask instructions in big and little endian modes.

Table 2-28. Stack Support Instructions in Big and Little Endian Modes

Instruction Register Operands Big Endian

Little

Endian

Single

POP

POPN

PUSH

PUSHN

A0 = A

A1 = B

A2 = C

A3 = D

A0 = D

A1 = C

A2 = B

A3 = A

Double

POP

POPN

PUSH

PUSHN

A0 = A

A1 = B

A2 = C

A3 = D

A4 = E

A5 = F

A6 = G

A7 = H

A0 = D

A1 = C

A2 = B

A3 = A

A4 = H

A5 = G

A6 = F

A7 = E

Table 2-29. Bit Mask Instructions in Big and Little Endian Modes

Instruction Register Operands Big Endian

Little

Endian

BMCHG.W

BMCLR.W

BMSET.W

BMTSTS.W

BMTSTC.W

BMTSET.W

NOT.W

AND.W

OR.W

EOR.W

A0 = A

A1 = B

A0 = B

A1 = A

031

BCD

Example: PUSH D0

D0 =

031

Example: PUSH D0 PUSH D1

D0 =

D1 =

015

Example: BMSET.W #$1234, (A0)

Data =

Mask = 12 34

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 759 760

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