AN910 datasheet(17/51 Pages) STMICROELECTRONICS

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ST7 AND ST9 PERFORMANCE BENCHMARKING

5 DESCRIPTION OF MCU WORK ENVIRONMENTS

This section is a short description of the work environment, with the tools used (hardware and

software tools), for each MCU during the benchmarks.

5.1 80C51XA MCU TOOLS

5.2 68HC16 MCU TOOLS

5.3 68HC12 MCU TOOLS

Hardware tools

P51XAG35 chip

P51XADB/E development board/emulator

Note that no external RAM was available on the development board.

Software tools

A Microsoft Windows based integrated development environment have been elaborated upon by

Macraigor Systems Incorporated. The interesting tools for the benchmarks were a standard

editor, an XA absolute macro assembler, and an emulator interface/debugger.

Hardware tools

MC68HC16Z1 chip

M68HC16Z1EVB evaluation board

Jumpers are set to configure the board.

Note that, to access the I/O pin used for execution time measuring, a context switch is needed

and add to each test routine 6 bytes and 375 ns. This length and time have been subtracted from

measured results, in order not to disadvantage this MCU. If they are taken into account, the

computing performance results are just a little worse (1.40) but code efficiency decreases down

to 1.45.

Note that the external RAM of the evaluation board needs wait states and so was not use.

Software tools

MASM16 (DOS environment) is an integrated environment for writing, editing assembling and

debugging source code. It also allows to set the assembler options which are:

masm -I'name'.lst -o'name'.o -a -b 'name'.asm >_masm16.err

EVB16 is a DOS debugger for 68HC16Z1EVB.

Hardware tools

MC68HC812A4 chip

M68HC12A4EVB evaluation board

Jumpers have been left as configured in factory.

Note that the external RAM of the evaluation board needs wait states and so was not use.

Software tools

The development of the routines is performed within an Integrated Development Environment

(IDE) : Motorola MCU software. In a Windows environment, this software brings a project

manager (MCU project), a macro-assembler (MCU asm), and a Motorola S-record generator

(hex). The compilation options are:

masm -y -W3 -I'name'.lst -a -o'name'.o 'name'.asm

hex -F'name'.hex 'name'.o

A communications program is then necessary to connect the PC to the evaluation board through

a RS232 serial link. We have used PROCOMM PLUS for Windows, but any other

communications program can suit the link to the Evaluation Board and its D-Bug12 monitor/

debugger program, resident in external EPROM.

Note that the ‘TBNE’, ‘TBEQ’, ‘DBNE’, ‘DBEQ’, ‘IBNE’, and ‘IBEQ’ instructions were not usable

without problems with the board used.

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