Freescale Semiconductor SC140 Example Push D0 Push D1, Example BMSET.W #$1234, A0, Data =

Memory Interface

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

Instruction	Register Operands	Big Endian	Little
			Endian

Single	Example: PUSH D0							A0 = A	A0 = D
POP		31					0	A1 = B	A1 = C
POPN								A2 = C	A2 = B
PUSH	D0 =		A	B	C	D		A3 = D	A3 = A
PUSHN
Double	Example: PUSH D0 PUSH D1							A0 = A	A0 = D
POP		31					0	A1 = B	A1 = C
POPN								A2 = C	A2 = B
	D0 =
PUSH			A	B	C	D		A3 = D	A3 = A
PUSHN	D1 =							A4 = E	A4 = H
				F	G	H
			E					A5 = F	A5 = G
								A6 = G	A6 = F
								A7 = H	A7 = E

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

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

Instruction	Register Operands	Big Endian	Little
			Endian

BMCHG.W	Example: BMSET.W #$1234, (A0)			A0 = A	A0 = B
BMCLR.W	15		0	A1 = B	A1 = A
BMSET.W
	Data =
BMTSTS.W		A	B
BMTSTC.W
	Mask =	12	34
BMTSET.W
NOT.W
AND.W
OR.W
EOR.W

SC140 DSP Core Reference Manual 2-67