Circuit Board Reference Manual

MCF548x Reference Manual, Rev. 3
3-20 Freescale Semiconductor
• Enhanced support for byte and word-sized operands through new move operations
• Enhanced support for position-independent code
For descriptions of the ColdFire instruction set, see the latest version of the ColdFire Programmer’s
Reference Manual.
The following list summarizes new and enhanced instructions of ISA_B:
• New instructions:
— INTOUCH loads blocks of instructions to be locked in the instruction cache.
— MOV3Q.L moves 3-bit immediate data to the destination location.
— MOVE to/from USP loads and stores user stack pointer.
— MVS.{B,W} sign-extends the source operand and moves it to the destination register.
— MVZ.{B,W} zero-fills the source operand and moves it to the destination register.
— SATS.L performs a saturation operation for signed arithmetic and updates the destination
register depending on CCR[V] and bit 31 of the register.
— TAS.B performs an indivisible read-modify-write cycle to test and set the addressed memory
byte.
• Enhancements to existing Revision_A instructions:
— Longword support for branch instructions (Bcc, BRA, BSR)
— Byte and word support for compare instructions (CMP, CMPI)
— Word support for the compare address register instruction (CMPA)
— Byte and longword support for MOVE.x,where the source is immediate data and the
destination is specified by d16(Ax); that is, MOVE.{B,W} #<data>, d16(Ax)
• Floating-point instructions. See Chapter 6, “Floating-Point Unit (FPU).”
• EMAC instructions. See Chapter 4, “Enhanced Multiply-Accumulate Unit (EMAC),” for more
information.
Table 3-7 shows the syntax for the new and enhanced instructions. As Table 3-7 shows, some ISA_B
opcodes were defined in the M68000 family and others are new.
Table 3-7. V4 New Instruction Summary
Instruction Mnemonic
1
Source Destination M68000
ISA_B Extensions
Branch Always bra.l <label> Yes
Branch Conditionally bcc.l <label> Yes
Branch to Subroutine bsr.l <label> Yes
Compare cmp.{b,w,l} <ea>y Dx Yes
Compare Address cmpa.w <ea>y Ax Yes
Compare Immediate cmpi.{b,w} #<data> Dx Yes
Instruction Fetch Touch intouch <Ay>
Move 3-Bit Data Quick mov3q.l #<data> <ea>x
Move Data Source to Destination move.{b,w} #<data> d16(Ax) Yes
Move from USP move.l USP Ax Yes