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Chapter 3
CPU Functions
User’s Manual U16580EE3V1UD00
3.2.3 Floating point arithmetic unit register set
The floating point arithmetic unit is provided with one flag register and one control register.
(1)
Floating point arithmetic control register (ECT)
This register is used for controlling the setting conditions of the TR flag:
TR is a logical OR between all the invalid operations the FPU can detect and each bit of ECT is a
mask bit for each condition.
Figure 3-10:
Floating Point Arithmetic Control Register (ECT)
Table 3-4:
Floating Point Arithmetic Unit Registers
Name
Usage
Operation
ECT
Control register
Sets the operation of the EFG register
EFG
Flag register
Holds the status of the FPU
31
13 12 11 10 9 8 7 6 5
4
3 2 1 0
After reset
00000000H
ECT
RFU
IT ZT VT UT PT 0
0
0
0
0
0
0 0
Bit position
Bit name
Description
31 to 13
RFU
Reserved field. Fixed to 0.
12
IT
Enables invalid operation detection in the TR value calculation
0: IV is set when an invalid operation is detected
1: IV and TR are set when an invalid operation is detected
11
ZT
Enables zero divide operation detection in the TR value calculation
0: ZD is set when a zero divide operation is detected
1: ZD and TR are set when a zero divide operation is detected
10
VT
Enables overflow detection in the TR value calculation
0: VF is set when an overflow is detected
1: VF and TR are set when an overflow is detected
9
UT
Enables underflow detection in the TR value calculation
0: UD is set when an underflow is detected
1: UD and TR are set when an underflow is detected
8
PT
Enables accuracy fail detection in the TR value calculation
0: PR is set when an accuracy fail is detected
1: PR and TR are set when an accuracy fail is detected
7 to 0
0
Reserved field. Fixed to 0.
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