MPC8540 datasheet(300/1302 Pages) FREESCALE

300 / 1302 page

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

6-50

Freescale Semiconductor

Core Register Summary

6.14.1 Accumulator (ACC)

FDBZE Embedded floating-point divide-by-zero exception enable

0 Exception disabled

1 Exception enabled

If the exception is enabled, a floating-point data exception is taken if FDBZ or FDBZH is set by a

floating-point instruction.

FUNFE Embedded floating-point underflow exception enable

0 Exception disabled

1 Exception enabled

If the exception is enabled, a floating-point data exception is taken if FUNF or FUNFH is set by a

floating-point instruction.

FOVFE Embedded floating-point overflow exception enable

0 Exception disabled

1 Exception enabled

If the exception is enabled, a floating-point data exception is taken if FOVF or FOVFH is set by a

floating-point instruction.

62–63

FRMC

Embedded floating-point rounding mode control

00 Round to nearest

01 Round toward zero

10 Round toward +infinity

11 Round toward –infinity

031 32

Field

Upper word

Lower word

Reset

All zeros

R/W

Figure 6-55. Accumulator (ACC)

Table 6-37. ACC FIeld Descriptions

Bits

Name

Function

0–31

Upper word

Holds the upper-word accumulate value for SPE multiply with accumulate instructions

32–63

Lower word

Holds the lower-word accumulate value for SPE multiply with accumulate instructions

Table 6-36. SPEFSCR Field Descriptions (continued)

Bits

Name

Function

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