AN910 datasheet(16/51 Pages) STMICROELECTRONICS

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ST7 AND ST9 PERFORMANCE BENCHMARKING

Table 4. Medium-end to low-end MCU strong and weak points

MCU

Strong points

Weak points

68HC11

(4 MHz)

medium 8/16-bit ALU:

long average ICT:

lacking instructions:

multitasking:

2500 ns 8x8 multiplication

1500 to 1750 ns

compare & branch like

decrement & branch like

no special capabilities

68HC08

(8 MHz)

instruction processing:

fast 8-bit ALU:

short average ICT:

special addr. modes:

special instructions:

large memory space:

1-byte prefetch queue

8-bit datapath

625 ns 8x8 multiplication

500 to 625 ns

indexed with 8-bit offset or

post-increment

compare & branch like

decrement & branch like

memory-to-memory moves

up to 4 Mbytes with memory

expansion module

lacking addr. modes:

multitasking:

no indirect addressing

no special capabilities

80C51

(20 MHz)

short average IL:

special addr. modes:

special instructions:

multitasking:

1 to 2 bytes

stack pointer relative

compare & branch like

decrement & branch like

bit test & bit clear & jump

memory-to-memory moves

context switching capabilities

slow 8-bit ALU:

long average ICT:

2400 ns 8x8 multiplication

900 to 1000 ns

KS88

(8 MHz)

special addr. modes:

special instructions:

multitasking:

interrupt processing:

indirect register/address

indexed (short/long)

compare & increment &

branch like

decrement & branch like

context switching capabilities

nested mode

level priority control register

slow 8-bit ALU:

long average ICT:

data memory location:

3000 ns 8x8 multiplication

1250 to 1500 ns

off-chip only

78K0

(10 MHz)

special addr. modes:

special instructions:

multitasking:

stack pointer relative

indexed with 8-bit offset

decrement & branch like

context switching capabilities

mixed architecture:

slow 8-bit ALU:

long average ICT:

only accumulator oriented

3200 ns 8x8 multiplication

1400 to 1600 ns

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