MC68LC060RC66 Freescale Semiconductor, MC68LC060RC66 Datasheet - Page 137

• Manufacturer Part Number: MC68LC060RC66
• Description: IC MPU 32BIT 66MHZ 206-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68LC060RC66

• Processor Type: M680x0 32-Bit
• Speed: 66MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 206-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

6.5 FLOATING-POINT EXCEPTIONS
There are two classes of floating-point-related exceptions: nonarithmetic floating-point
exceptions and arithmetic floating-point exceptions. The latter relates to the handling of
arithmetic exceptions caused by floating-point activity, and the former includes unimple-
mented floating-point instructions, unsupported data types and unimplemented effective
addresses not related to the handling of arithmetic exceptions. The floating-point format
error exception is considered an integer unit exception (see Section 8 Exception Process-
ing). The following paragraphs detail floating-point exceptions and how the MC68060 and
M68060SP handle them. Table 6-10 lists the vector numbers related to floating-point excep-
tions.
The following paragraphs detail nonarithmetic floating-point exceptions.
6.5.1 Unimplemented Floating-Point Instructions
Table 6-11 lists the floating-point instructions which are unimplemented on the MC68060.
Refer to 8.2.4 Illegal Instruction and Unimplemented Instruction Exceptions for back-
ground material. Motorola provides the M68060SP, a software package that includes float-
ing-point emulation for the MC68060. Refer to Appendix C for software porting information.
MOTOROLA
For floating-point pre-instruction exceptions, the PC points to the next floating-point instruction and the stack frame of for-
mat 0 is generated. For post-instruction exceptions, the PC points to the next instruction and the frame of format 3 is gen-
erated.
Number
Vector
11
55
60
48
49
50
51
52
53
54
Vector Offset
(Hex)
0DC
0CC
02C
0C0
0C4
0C8
0D0
0D4
0D8
0F4
Table 6-10. Floating-Point Exception Vectors
Format
Frame
0,2,3
0,3
0,3
0,3
0,3
0,3
2
0
0
0
M68060 USER’S MANUAL
Program
Counter
next
next
fault
fault
next
next
next
next
next
next
Floating-Point Unimplemented Instruction Exception
Floating-Point Unimplemented Data Type
Unimplemented Effective Address Exception
Floating-Point Branch or Set on Unordered Condition
Floating-Point Inexact Result
Floating-Point Divide-by-Zero
Floating-Point Underflow
Floating-Point Operand Error
Floating-Point Overflow
Floating-Point SNAN
Assignment
Floating-Point Unit
6-19