DSP56303 datasheet(254/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

B-10

Freescale Semiconductor

Programming Reference

B.3 Programming Sheets

Figure B-1. Status Register (SR)

Application:

Date:

Programmer:

Sheet 1 of 2

Central Processor

15 14 13 12 11 10

987

6543

210

19 18 17 16

23 22 21 20

Scaling Mode

S(1:0)

Scaling Mode

No scaling

Scale down

Scale up

Reserved

Interrupt Mask

I(1:0)

Exceptions Masked

None

IPL 0

IPL 0, 1

IPL 0, 1, 2

Carry

Overflow

Zero

Negative

Unnormalized ( U = Acc(47) xnor Acc(46) )

Extension

Limit

FFT Scaling ( S = Acc(46) xor Acc(45) )

Sixteen-Bit Compatibilitity

Double Precision Multiply Mode

Loop Flag

DO-Forever Flag

Sixteen-Bit Arithmetic

Instruction Cache Enable

Arithmetic Saturation

Rounding Mode

Core Priority

CP(1:0)

Core Priority

0 (lowest)

3 (highest)

*= Reserved, Program as 0

Mode Register (MR)

Condition Code Register (CCR)

Extended Mode Register (EMR)

Status Register (SR)

Read/Write

Reset = $C00300

CP1

CP0

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