Program Control Instructions; Program Control Operations - Motorola MC68030 User Manual

3.2.8 Program Control Instructions
A set of subroutine call and return instructions and conditional and uncon-
ditional branch instructions perform program control operations. The no
operation instruction (NOP) may be used to force synchronization of the
internal pipelines. Table 3-8 summarizes these instructions.
Table
3-8.
Program Control Operations
Instruction Operand Syntax Operand Size Operation
Integer and Floating-Point Conditional
Bcc
<label>
8,16,32
if condition true, then PC + d • PC
OBcc
On,<label> 16 if condition false, then On -1 • On
if On io -1, then PC + d • PC
Scc
<ea> 8
if condition true, then 1 's • destination;
else O's • destination
Unconditional
BRA <label> 8,16,32
PC+d. PC
BSR <label> 8,16,32 SP-4. SP; PC. (SP); PC+d. PC
JMP <ea> none
destination. PC
JSR
<ea>
none SP-4. SP; PC. (SP); destination. PC
NOP none none PC+2. PC
Returns
RTO #<d> 16 (SP). PC; SP+4+d. SP
RTR none none (SP). CCR; SP+2. SP; (SP). PC; SP+4. SP
RTS none none (SP). PC; SP+4. SP
Letters cc in the integer instruction mnemonics Bcc, OBee, and Sec specify testing one of the following conditions:
CC - Carry clear GE - Greater or equal
LS - Lower or same PL - Plus
CS - Carry set GT - Greater than
L T - Less than T - Always true*
EQ - Equal HI - Higher
MI - Minus VC - Overflow clear
F - Never true* LE - Less or equal
NE - Not equal VS - Overflow set
*Not applicable to the Bcc or cpBcc instructions.
MOTOROLA MC68030 USER'S MANUAL
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