Datasheet

Chapter 2. ColdFire Core 2-19

Instruction Set Summary

• 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)

Table 2-7 shows the syntax for the new and enhanced instructions, which are fully

described in Section 2.9, “ColdFire Instruction Set Architecture Enhancements.”

Some proposed opcodes were formerly present in the M68000 family, while other opcodes

are new functions.

2.6.2 Instruction Set Summary

Table 2-8 lists implemented user-level instructions by opcode.

Table 2-7. ColdFire ISA_B Extension Summary

Instruction Mnemonic

Operand sizes in this column reﬂect only newly supported operand sizes for existing instructions

(Bcc, BRA, BSR, CMP, CMPA, CMPI, and MOVE)

Source Destination 68K

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 with Sign Extend mvs.{b,w} <ea>y Dx

Move with Zero-Fill mvz.{b,w} <ea>y Dx

Signed Saturate sats.l Dx

Test and Set an Operand tas.b <ea>x Yes

Table 2-8. User-Level Instruction Set Summary

Instruction Operand Syntax Operand Size Operation

ADD Dy,<ea>x

<ea>y,Dx

Source + destination → destination

ADDA <ea>y,Ax .L Source + destination → destination