Freescale Semiconductor MC68881 - Accrued Exception Byte; Condition Code Byte; Mode Control Byte; Quotient Byte

7 6 4
PREC I RND I
[
3 2 1 0
Figure 1-3. Mode Control Byte
ROUNDING MODE:
O0 TO NEAREST
01 TOWARD ZERO
10 TOWARD MINUS INFINITY
11 TOWARD PLUS INFINITY
ROUNDING PRECISION:
O0 EXTENDED
01 SINGLE
10 DOUBLE
11 (UNDEFINED, RESERVED)
31 30 29 28 27 26 25 24
Figure 1-4; Condition Code Byte
NOT A NUMBER OR UNDRDERED
INFINITY
ZERO
NEGATIVE
23
22 20 19 18 17 16
QUOTIENT
I
Figure 1-5. Quotient Byte
SEVEN LEAST SIGNIFICANT
GtTS OF QUOTIENT
SIGN OF QUO"flENT
E
OP I OVI
5 4 3 2 1 O
°"F~ I °z I '"~x I ° I
I
Figure 1-6. Accrued Exception Byte
INEXACT
DIVIDE BY ZERO
UNDERFLOW
OVERFLOW
INVAUO OPERATION
MC68881/MC68882 USER'S MANUAL FREESCALE
1-5