Renesas User System Interface Cable HS36049ECH61H Manuale Utente Scaricare il pdf (Pagina 9)

H8 MCUs: Faster

Execution Times

Besides maintaining compat-

ibility within the family,

H8 CPUs have been optimized

for high performance.

The majority of the instruc-

tions in the powerful CISC

instruction set will execute

in one clock cycle, giving

RISC-like operation.

Enhanced Hardware

for Performance

Enhanced multipliers and

dividers are included in the

CPU core to boost throughput

for mathematical operations

and further enhance the

performance of the CPU cores.

The H8S/2600 and H8SX

CPU cores each have a

hardware MAC (Multiply and

Accumulate) block for extra

performance in applications

that involve data computa-

tions.

H8 MCU System

Performance

H8 microcontrollers are designed to

deliver high throughput for excellent

application performance.

For example, their CISC CPU cores

execute most instructions in just one

clock cycle, and their Advanced

Data Management peripherals

utilize a 3-bus architecture to speed

data transfers.

Also, the on-chip Flash can be

accessed in a single cycle, achieving

the best possible performance

per MHz.

H8/300 H8/300H H8S/2000 H8S/2600 H8SX

Basic Instructions Execution 2 cycles 2 cycles 1 cycle 1 cycle 1 cycle

Bus Width 8-bit 16-bit 16-bit 16-bit 32-bit

No. of Instructions 57 64 65 69 87

Address Space 64KB 16MB 16MB 16MB 4GB

9 MIPS

H8S/2000

@ 20 MHz

11 MIPS

H8S/2000

@ 25 MHz

15.2 MIPS

H8S/2600

@ 33 MHz

H8SX

@ 35 MHz

35 MIPS

H8SX

@ 50 MHz

50 MIPS

Dhrystone 1.1 MIPS value

40

30

20

10

50

Instruction H8S H8SX

MULXU.B 3 1

MULXU.W 4 1

MULXS.B 4 2

MULXS.W 5 2

MULU.W - 2

MULU.L - 5

MULS.W - 2

MULS.L - 5

MULU/U.L - 6

MULS/U.L - 6

CLRMAC 1 1

LDMAC 1 1

STMAC 2 1

MAC 4 4

Instruction H8S H8SX

DIVXU.B 12 10

DIVU.W - 10

DIVXU.W 20 18

DIVU.L - 18

DIVXS.B 13 12

DIVS.W - 11

DIVXS.W 21 20

DIVS.L - 19

H8 Family CPU Core Overview

Advanced Multiplier

execution cycles

Advanced Divider

execution cycles

The H8 Architecture

7

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 49 50

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