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BGND
Operation:
Assembler
Syntax:
Attributes:
Description:
ground mode (if enabled). The freeze output is asserted to acknowledge entrance
into background mode. Upon exiting background mode, instruction execution contin-
ues with the instruction pointed to by the program counter.
If background mode is not enabled, the processor initiates illegal instruction
exception processing. The vector number is generated to reference the illegal
instruction exception vector. Background mode is covered in SECTION 7 DEVEL-
OPMENT SUPPORT.
Condition Codes:
X
N
Z
—
—
—
X
Not affected
N
Not affected
Z
Not affected
V
Not affected
C
Not affected
Instruction Format:
15
14
13
0
1
0
CPU32
REFERENCE MANUAL
Enter Background Mode
If (background mode enabled)
then enter Background Mode
else Format/Vector offset → – (SSP)
PC → – (SSP)
SR → – (SSP)
(Vector) → PC
BGND
Size = (Unsized)
The processor suspends instruction execution and enters back-
V
C
—
—
12
11
10
9
0
1
0
1
INSTRUCTION SET
8
7
6
5
0
1
1
1
BGND
4
3
2
1
1
1
0
1
MOTOROLA
0
0
4-41
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