AN910 Datasheet, PDF (19/51 Pages) STMicroelectronics – ST7 AND ST9 PERFORMANCE BENCHMARKING

ST7 AND ST9 PERFORMANCE BENCHMARKING
5.7 68HC11 MCU TOOLS
Hardware tools
Software tools
MC68HC11A8 chip
MC68HC11A8EVM evaluation board
Note that the internal chip frequency on evaluation board was 2 MHz, but as 4 MHz versions are
available, this frequency was used for results (execution time values have been divided by 2).
Note that it was not possible to emulate external RAM.
The integrated assembler IASM11 (DOS environment) allows to blend an editor and a cross
assembler into one single environment.
A DOS environment is used to debug programs.
5.8 68HC08 MCU TOOLS
Hardware tools
Software tools
MC68HC708XL36 chip
EML08XL36 emulator module plugged in the M68MMEVS05 modular evaluation system
(platform board for EML08XL36)
Jumpers configure both.
Rapid, a software development tool in a DOS environment allows to execute all the operations.
It consists of a configuration program (Rinstall) and a cross assembler (CASM). Rinstall contains
a serie of data entry screens. Only CASM and the MMEV08X DOS debugger were configured
as follows:
• Cross assembler configuration: “CASM assembler” entry screen
Name and fully path: 'path_of_CASM08.exe'
Primary options: S L D
Secondary options: S L D I
• Debugger configuration: “Debugger” entry screen
Fully path: 'path_of_MMEVS08.exe'
Options: -B
Note that the assembler does not seem to manage the zero page addressing mode. Thus, the
results have been modified to take this addressing mode into account. Without zero page
addressing mode, the execution time result changes to 0.61 and the code size result increases
up to 1.43.
5.9 ST7 MCU TOOLS
Hardware tools
Software tools
ST7275 chip
ST7 HDS (Hardware Development System) emulator with ST7275 DBE (Dedicated Board
Emulator)
Note that measures have been made with a 4 MHz MCU, but as 8 MHz versions exist, two values
are presented with the two frequencies (for the 8 MHz version, execution time values have been
divided by 2).
The toolchain used for the ST7 includes a meta-assembler (ASM), a generic linker (LYN), and a
generic formatter (OBSEND). These software tools are used with the following options :
asm -sym -li 'name'
lyn 'name'
asm 'name' -fi = 'name'.map
obsend 'name', f, 'name'.s19, srec
The Windows environment is used by the debugger: Windows Debugger WGDB7.
19/51