1 Introduction Purpose  This course gives an overview of assembler settings of the High-performance Embedded Workshop (HEW), used for developing software for embedded systems built with microcontrollers (MCUs) from Renesas Technology Corp. Objectives  Understand the five main categories of assembler configuration  Learn how the settings affect the assembler compilation process Content  28 pages  2 questions Learning Time  35 minutes

2 Invoke Assembler Configuration Steps to invoke Assembler toolchain configuration  Click on Build  Select the H8 Standard Toolchain Assembler settings for a specific project or file configuration can be selected here Corresponding command- line entries for all settings appear in HEW linker dialog

3 Five categories of options Options in Assembler To configure the source-file related information; for example, location of the include files, etc. To configure the output: debug information, optimization, output file directory, and more To adjust the symbol access format To adjust the symbol access format To select what will be provided in the list file To configure various other options, including those that are user-defined To configure various other options, including those that are user-defined 1. Source 2. Object 3. List 4. Tuning 5. Other 1. Source 2. Object 3. List 4. Tuning 5. Other

4 Source-file Related Information Source Settings  Include file directories - Specifies destination path name of included files  Defines - Defines replacement string literal  Preprocessor variables - Defines integer and character preprocessor variables

5 Include File Directories Source settings  Include file directories - Specifies directory of files to be included or linked to current source program Example: HEW workspace named “tutorial” contains “header.h” file at: C:\tutorial\tutorial\include\header.h The steps shown here would be required to add/include the “header.h” file to the current source program search list.

6 Defines Source settings  Defines - Based on same concept as “.DEFINE” directive Example: SYM2:. DEFINE “r2” : mov.wSYM2, r1 : “SYM2” will be replaced with r2 at assembly.

7 Preprocessor Variables Source settings  Preprocessor variables - Has same concept as “.ASSIGNA” and “.ASSIGNC” directives. Example: FLAG:.ASSIGNC “ON” :.AIF“\&FLAG” EQ “ON” mov.wr2, r1.AENDI : FLAG is set to ON. if FLAG = ON, then “mov.wr2, r1” is assembled.

8 Five categories of options Options in Assembler To configure the source-file related information; for example, location of the include files, etc. To configure the output: debug information, optimization, output file directory, and more To adjust the symbol access format To adjust the symbol access format To select what will be provided in the list file To configure various other options, including those that are user-defined To configure various other options, including those that are user-defined 1. Source 2. Object 3. List 4. Tuning 5. Other 1. Source 2. Object 3. List 4. Tuning 5. Other

9 Configuring Assembler Output Object settings  Debug information  Generate assembly source file after preprocess  Optimize  Default of branch displacement size  Generate file for inter- module optimization  Output file directory

10 Information for Debugging Object settings  With/without debug information - Specifies whether or not debugging information will be output - Valid only when object module is generated - Default: “Without debug information” (i.e., no debug information is produced)

11 Source File after Preprocess Object settings  Generate assembly source file after preprocess - Outputs an assembler source file for which macro expansion, conditional assembly, structured assembly, and file inclusion have been performed - When this option is specified, no object is generated Example of Macro expansion:.MACROMCO, RnExpanded results: add\Rn, \Rnaddr1, r1 inc.w\Rninc.wr1.ENDM MCOr1addr2, r2 MCOr2inc.wr2

12 Adjust PC-related Instructions Object settings  Optimize - If selected, the assembler will adjust the the displacement size of register-indirect with displacement instructions, and the address size of the absolute addressing format - This option is valid for executable instructions when a displacement (:8 or :16) is not specified, or an allocated size (:8, :16, :24, or :32) of an absolute address is not specified.

13 Size of Branch Displacement Object settings  Default of branch displacement size - This option specifies the default size for the number of bits used to represent displacement for branch instruction - Default bit setting depends on CPU type This option is valid when a displacement size (8 or 16 bit) is specified and the optimize option is not specified. Default bit settings: 8 bits for H8/300, H8/300L, H8/300HN, H8S/2000N, H8S/2600N, and H8SXN CPU types 16 bits for H8/ 300HA, H8S/2000A, H8S/2600A, H8SXM, H8SXA, and H8SXX CPU types

14 Inter-module Optimization Object settings  Generate file for inter- module optimization - Outputs additional information for inter-module optimization  Output file directory - Controls object module output

16 Five categories of options Options in Assembler To configure the source-file related information; for example, location of the include files, etc. To configure the output: debug information, optimization, output file directory, and more To adjust the symbol access format To adjust the symbol access format To select what will be provided in the list file To configure various other options, including those that are user-defined To configure various other options, including those that are user-defined 1. Source 2. Object 3. List 4. Tuning 5. Other 1. Source 2. Object 3. List 4. Tuning 5. Other

17 Contents of List File List settings  Generate list file - Controls output of assembly listing  Source program - Controls output of source program listing  Cross Reference - Controls output of cross- reference listing  Section - Controls output of section information listing Source program: Cross reference: Section:

18 List File Generation List Settings  Generate list file - Select this option to output an assembly listing

19 Include/Exclude Source Program List settings  Source program - Choice of “Shown” (include) or “Not shown” (exclude) - Default setting is “Shown,” so source program will be included in Assembly list file if “Generate list file” box is not checked

20 Contents of Source Program List List settings  Conditionals - Unsatisfied.AIF or.AIFDEF statements  Definitions - Macro definition parts,.AREPEAT and.AWHILE definition parts,.INCLUDE directive statements,.ASSIGNA and.ASSIDGNC directive statements  Call - Macro call statements.AIF,.AIFDEF, and.AENDI directive statements  Expansions - Macro expansion statements.AREPEAT and.AWHILE expansion statements  Structured - Structured assembly expansion statements  Code - Object code lines exceeding the source statement lines

21 Cross Reference, Section List settings  Cross reference - Specifies whether or not to output a cross reference listing to the Assembly listing  Section - Specifies whether or not to output a section information listing to the Assembly listing Defaults: Default setting for both Cross reference and Section is “Shown.” Thus, each will be included in Assembly listing unless “Not shown” is selected.

22 Five categories of options Options in Assembler To configure the source-file related information; for example, location of the include files, etc. To configure the output: debug information, optimization, output file directory, and more To adjust the symbol access format To adjust the symbol access format To select what will be provided in the list file To configure various other options, including those that are user-defined To configure various other options, including those that are user-defined 1. Source 2. Object 3. List 4. Tuning 5. Other 1. Source 2. Object 3. List 4. Tuning 5. Other

23 Symbol Access Format Tuning settings  Option to set - Specifies whether symbols to be accessed in 8-bit or 16-bit absolute address format  Specify all symbols - All symbols are set according to the format

24 Restricting the Access Format Tuning settings  Set symbol - “Specify all symbols” box is not checked, but sym1 and sym3 are entered - Only sym1 & sym3 are accessed in 8-bit absolute address (sym2 remains unchanged; it is accessed in 32-bit absolute address) Example:.IMPORT sym1, sym2, sym3 r1;8bit r2;32bit r3;8bit

25 Five categories of options Options in Assembler To configure the source-file related information; for example, location of the include files, etc. To configure the output: debug information, optimization, output file directory, and more To adjust the symbol access format To adjust the symbol access format To select what will be provided in the list file To configure various other options, including those that are user-defined To configure various other options, including those that are user-defined 1. Source 2. Object 3. List 4. Tuning 5. Other 1. Source 2. Object 3. List 4. Tuning 5. Other

26 Options in “Other” Category “Other” settings  Miscellaneous options - Control output of the symbol information on import symbols that have not been referenced  User-defined options - Add information that is not available for a setting can be included as command line Example: sym1 & sym3 are set to 8-bit absolute address, but all other symbols must be set to 16-bit absolute address. Instead of inputting all of the other symbols, a command line can be added.

28 Categories for H8 Assembler configuration Assembler settings within each category and what they do Course Summary Download a free evaluation copy of HEW at: