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Chapter 3
CPU Functions
User’s Manual U16580EE3V1UD00
(2)
Floating point arithmetic status register (EFG)
Figure 3-11:
Floating Point Arithmetic Status Register (EFG)
31
14 13 12 11 10 9 8 7 6 5
4
3 2 1 0
After reset
00000000H
EFG
RFU
RO IV ZD VF UD PR 0
0
0 TR 0 OV S Z
Bit position
Bit name
Description
31 to 14
RFU
Reserved field. Fixed to 0.
13
RO
Running Operation: indicates whether the floating point arithmetic unit is running
0: operation in progress
1: FPU idle
12
IV
InValid operation: Indicates that an invalid operation has been requested.
0: normal operation
1: invalid operation detected
11
ZD
Zero Divide: Indicates whether a division by 0 has been detected.
0: normal operation
1: division by 0 detected
10
VF
oVerFlow: indicates that the result of executing a floating point operation has
overflowed.
0: no overflow generated
1: overflow generated
9
UD
Undervalue: indicates that the result of executing a floating point operation has
underflowed.
0: no underflow generated
1: underflow generated
8
PR
PRecision error: indicates that an accuracy failure occurred.
0: no accuracy failure occurred
1: accuracy failure occurred
7 to 5
0
Reserved field. Fixed to 0.
4
TR
This flag summarizes the state of the FPU:
0: normal state
1: abnormal condition detected: one of the bits 13 to 8 is set.
The setting conditions of this flag depends on the ECT register value.
3
0
Reserved field. Fixed to 0.
2
OV
Indicates whether an overflow occurred during floating point to integer conversion
0: no overflow generated
1: overflow generated
1
S
Indicates whether floating point operation result is negative.
0: Operation result is not negative.
1: Operation result is negative.
0
Z
Indicates whether floating point operation result is 0.
0: Operation result is not 0.
1: Operation result is 0.
Содержание V850E/PH2
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Страница 192: ...192 Chapter 5 Memory Access Control Function PD70F3187 only User s Manual U16580EE3V1UD00 MEMO...
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Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00...
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Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO...
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