Renesas M16C FAMILY Manual de usuario descargar pdf (Pagina 9)

Read

Operation

Read

Operation

Instruction

Fetch

instruction

Decode

instruction

Read micro

instruction

Write

result

Read

Operation

Instruction

Fetch

instruction

Decode

instruction

Read micro

instruction

Write

result

Clock

Instruction

Fetch

instruction

Decode

instruction

Read micro

instruction

Write

result

Hazard

processing

Top Reasons to Select the M16C Platform

™

1InstInst 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Instructions in the

interrupt routine

1InstInst 2 3 4 5

Instructions in the

interrupt routine

Normal

Response

Interrupt request generated

Interrupt request acknowledged

Interrupt Sequence

Executes in approximately one-fourth

the number of clock cycles

R32C/100

M32C/80

High-speed

Response

PC SVP

FLG SVF

ISR

Addr

VCT

A single interrupt can be set

as a high-speed interrupt.

Bank 0

Active when bank

bit “B” in flag register

= 0 (default state)

R0H R0L

R1H R1L

Bank 1

Active when bank

bit “B” in flag

R0H R0L

R1H R1L

Dual

Banks

SWITCH

Good for

entering

interrupt:

Do not need to

save to stack when

switching to another bank.

*The interrupt return instruction requires three cycles (one-half that required by the M16C).

Other interrupt sequences use 14 cycles on the R32C/100 and M32C/80.

R32C CPU

Core Pipeline

The number of pipeline stages

has been increased from three

(previous version) to five to

boost processing speed.

High-Speed Interrupt Processing (R32C/M32C)

Rounding modes

Exception processing

32 bits

Instruction set

• Illegal input

• Overflow

• Underflow

CNVIF: Convert integer → floating point number

ROUND: Convert floating point number → integer

ADDF: Floating point add

SUBF: Floating point subtract

MULF: Floating point multiply

DIVF: Floating point divide

CMPF: Floating point compare

• Round to nearest value

• Round towards zero

• Round towards negative infinity

Mantissa (23 bits)

Exponent (8 bits)

Sign (1 bit)

Supported numeric values

• Normalized numbers: 0 < exponent < 255

• Zero: 0 and mantissa = 0

Unsupported numeric values

• Not a number (Nan): Exponent = 255 and mantissa ≠ 0

• Infinity: Exponent = 255 and mantissa = 0

• Subnormal numbers: Exponent = 0 and mantissa ≠ 0

(–1)

sign

× 2

exponent –127

× (1 + mantissa)

Data format (single-precision floating point number)

Floating Point

Instructions (R32C)

The R32C incorporates a

single-precision 32-bit FPU

inline and supports floating

point instructions.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 45 46

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