Motorola M68000 User Manual download pdf (Page 196)

Supervisor (Privileged) Instructions

MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 6-33

PFLUSH Flush Entry in the ATC PFLUSH

(MC68030 only)

Instruction Format:

Instruction Fields:

Effective Address ﬁeld—Speciﬁes a control alterable address. The address translation

cache entry for this address is invalidated. Valid addressing modes are in the

following table:

NOTE

The address ﬁeld must provide the memory management unit

with the effective address to be ﬂushed from the address

translation cache, not the effective address describing where the

PFLUSH operand is located. For example, to ﬂush the address

translation cache entry corresponding to a logical address that

is temporarily stored on top of the system stack, the instruction

PFLUSH [(SP)] must be used since PFLUSH (SP) would

invalidate the address translation cache entry mapping the

system stack (i.e., the effective address passed to the memory

management unit is the effective address of the system stack,

not the effective address formed by the operand located on the

top of the stack).

1514131211109876543210

1111000000

EFFECTIVE ADDRESS

MODE REGISTER

0 0 1 MODE 0 0 MASK FC

Addressing Mode Mode Register Addressing Mode Mode Register

Dn — — (xxx).W 111 000

An — — (xxx).L 111 001

(An) 010 reg. number:An # < data > — —

(An) + — —

—(An) — —

,An) 101 reg. number:An (d

,PC) — —

,An,Xn) 110 reg. number:An (d

,PC,Xn) — —

(bd,An,Xn) 110 reg. number:An (bd,PC,Xn) — —

([bd,An,Xn] ,od) 110 reg. number:An ([bd,PC,Xn] ,od) — —

([bd,An],Xn ,od) 110 reg. number:An ([bd,PC],Xn ,od) — —

1 2 ... 191 192 193 194 195 196 197 198 199 200 201 ... 356 357

No comments

Motorola M68000 User Manual Page 196