AN910 datasheet(13/51 Pages) STMICROELECTRONICS

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ST7 AND ST9 PERFORMANCE BENCHMARKING

Table 3. High-end to low-end MCU strong and weak points

MCU

Strong points

Weak points

80C51XA

(20 MHz)

instruction processing:

fast 8/16-bit ALU:

short average ICT:

special addr. modes:

special instructions:

multitasking:

large memory space:

interrupt processing:

7-byte prefetch queue

predecoding

16-bit datapath

600 ns 8x8 multiplication

250 to 300 ns

indirect with 8/16 offset or

auto-increment

compare & branch like

decrement & branch like

memory-to-memory moves

context switching capabilities

up to 16 Mbytes

nested mode

4-bit program priority register

programmable priority levels

address alignment:

lacking addr. modes:

even jump/branch address

even word operand address

NOP instructions in assembly

code

no indexed addressing

68HC16

(16 MHz)

instruction processing:

fast 8/16/32-bit ALU:

short average ICT:

special addr. modes:

special instructions:

multitasking:

large memory space:

interrupt processing:

3-stage prefetch queue

predecoding

16-bit datapath

625 ns 8x8 multiplication

375 to 440 ns

post-modified indexed

with 8-bitoffset

memory-to-memory moves

context switching capabilities

up to 1 Mbyte

up to 16 Mbytes with memory

expansion module

nested mode

3-bit program priority register

programmable priority levels

address alignment:

instruction lengths:

lacking addr. modes:

lacking instructions:

performance penalty if odd

word operand addresses

only even

no direct addressing

index register manipulation

compare & branch like

decrement & branch like

68HC12

(8 MHz)

instruction processing:

fast 8/16-bit ALU:

short average ICT:

special addr. modes:

special instructions:

large memory space:

2-stage prefetch queue

predecoding

20-bit datapath

375 ns 8x8 multiplication

375 to 500 ns

auto-incr/decrement indexed

accumulator offset indexed

memory-to-memory moves

incr/decrement & branch like

test & branch like

up to 4 Mbytes with memory

expansion module

multitasking:

interrupt processing:

need memory expansion

module

one interrupt at a time

recommended

no program priority register

hardware fixed priorities

H8/300

(10 MHz)

instruction encoding:

short average IL:

special addr. modes:

special instructions:

risc-like encoding

2 to 3 bytes

or pre/post-increment

block moves

instruction processing:

medium 8/16-bit ALU:

medium average ICT:

lacking instructions:

multitasking:

memory space:

interrupt processing:

standard (no prefetch)

1400 ns 8x8 multiplication

500 to 600 ns

16-bit shifts/rotations

compare & branch like

decrement & branch like

no special capabilities

64 kbytes

one interrupt at a time

recommended

no program priority register

hardware fixed priorities

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