SH7750 datasheet(13/1162 Pages) RENESAS

13 / 1162 page

Rev.7.00 Oct. 10, 2008 Page xiii of lxxxiv

REJ09B0366-0700

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Page

Revision (See Manual for Details)

5.7 Usage Notes

182

Description amended

2. If a general exception or interrupt occurs when SR.BL = 1

a. General exception

When a general exception other than a user break occurs, a

manual reset is executed. The value in EXPEVT at this time

is H'0000 0020; the value of the SPC and SSR registers is

undefined.

...

3. SPC when an exception occurs

a. Re-execution type general exception

The PC value for the instruction in which the general

exception occurred is set in SPC, and the instruction is re-

executed after returning from exception handling. If an

exception occurs in a delay slot instruction, however, the PC

value for the delay slot instruction is saved in SPC regardless

of whether or not the preceding delayed branch instruction

condition is satisfied.

b. Completion type general exception or interrupt

The PC value for the instruction following that in which the

general exception occurred is set in SPC. If an exception

occurs in a branch instruction with delay slot, however, the

PC value for the branch destination is saved in SPC.

6.5 Floating-Point

Exceptions

• Enable/disable

exception handling

194

Description amended

For information on these possibilities, see the individual

instruction descriptions in chapter 9 of the SH-4 Software

Manual. The particulars differ demanding on the instruction. All

exception events that originate in the FPU are assigned as the

same exception event. The meaning of an exception is

determined by software by reading system register FPSCR and

interpreting the information it contains.

6.6.2 Pair Single-

Precision Data Transfer

196

Description amended

In addition to the geometric operation instructions, the FPU

also supports high-speed data transfer instructions.

When FPSCR.SZ = 1, the FPU can perform data transfer by

means of pair single-precision data transfer instructions.

6.7 Usage Notes

197 to

207

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