Introduction to Holtek ASM Programming

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Presentation transcript:

Introduction to Holtek ASM Programming

Section-based Programming Relocatable segment of code/data Logical division of program

Concept of Relocation Linker section-1 section-2 section-1 section-2

Section Syntax Name : .section : alignment: combine: class: defined by user reversed word byte / word / page at addr / common code / data

Directive Define Variable Data name DB ? name DB repeated-count DUP(?) name DW ? name DW repeated-count DUP(?) name DBIT

Example data0 .section ‘data’ var db ? array db 5 dup(?) var1 dw ? Array1 dw 3 dup(?) flag dbit

Directive Define Variable Data name LABEL BYTE name DBIT Example data .section ‘data’ mySTATUS label byte C dbit AC dbit Z dbit OV dbit

Directive Define Constant Data [label:] DC expr1[,expr2[,..]]  must in code section Example: code .section ‘code’ MyTable: DC 0128h, 0ffh, 10h+20h

Directive ORG ORG expression  Relative to section beginning eg. org 0ffh org 10+20

Directive EQU name EQU expression  NOT variable definition eg. PortA EQU [12h] bmove EQU mov Ten EQU 10

Directive PROC/ENDP PROC/ENDP name PROC ... (function body) name ENDP

Directive END END ... mov a,20h end mov a,10h ; ignored

Directive PUBLIC & EXTERN public name[,name]..... code: label data: data defined by DB, DBIT extern name:type[,name:type].... type: near, bit, byte

Example public var1 extern func1:near data .section at 40h 'data' var1 db ? c1 .section at 0 'code' mov a,10h mov var1,a call func1 jmp $ end extern var1: byte public func1 c2 .section 'code' func1 proc mov a,var1 add a,010h ret func1 endp

Directive MACRO/ENDM name MACRO [param1[,param2]] LOCAL loc1,loc2 ... ENDM

Multiple-defined labels in Macro Expansion delay Macro label: EndM Solution: delay Macro Local label label: EndM ... delay . label: . label:

Example Macro 1 delay macro para1 2 local a1 3 a1: 4 sdz para1 5 jmp a1 6 endm 7 8 include ht48c30-1.inc 9 data .section 'data' 10 tmp1 db ? 11 code .section 'code' 12 mov a,30h 13 mov tmp1,a 14 delay tmp1 15 delay tmp1 16 jmp $ 17 end

Directive Conditional IF statememts [ELSE statements] ENDIF IF expression IFE expression IFDEF name IFNDEF name

Example Conditional Assembler 1 include ht48c30.inc 2 _debug equ 1 3 code .section 'code' 4 ifdef _debug 5 mov a,10h 6 endif 7 ifndef _debug 8 mov a,20h 9 endif 10 if _debug 11 mov a,30h 12 endif 13 ife _debug 14 mov a,40h 15 endif 16 mov a,50h 17 add a,30h 18 jmp $

Directive File Control .LIST .NOLIST .LISTMACRO .NOLISTMACRO .LISTINCLUDE .NOLISTINCLUDE MESSAGE INCLUDE

Directive Others HIGH/LOW OFFSET SHR/SHL Example: data .section 'data' array db 10 dup(?) code .section 'code' mov a,11111111b SHR 1 ;7fH mov a,0ffh AND 0fh ; 0fH mov a,offset array ; mov a,LOW 0abcdh ; cdH mov a,HIGH 0abcd ; abH jmp $

Example: Table Read routine .section page 'code' ; input acc for index, ; output on ‘pattern’ ReadPattern PROC add A,LOW OFFSET pattern_table mov TBLP,A tabrdc pattern[0] mov A,TBLH mov pattern[1],A ret ReadPattern ENDP pattern_table: DC 2332h, 0232h, 1897h used_data .section 'data' pattern DB 2 dup(?)

Bank (Organization) ROM RAM 0H 0H 40H ... ... 1FFFH FFH BP 76543210

Bank (Assignment) Format: ROMBANK <bank> <sec1>,<sec2>,... Example: ROMBANK 0 entry,main ROMBANK 1 routine entry .section at 0 ‘code’ main .section ‘code’ routine .section ‘code’

Bank (Usage) ROM RAM ; modify BP MOV A, NewBP MOV BP, A ; JMP/CALL to switch bank JMP label CALL func ; modify BP MOV A, NewBP MOV BP, A ; set MP1 MOV A, BankOffset MOV MP1, A ; read/write thr. R1 MOV R1, A MOV A, R1

Listing File Find syntax error in MACRO/INCLUDE .listinclude .listmacro Macro nested level Offset relative to section Operand type: external reference/relocatable name

Map file Result of section relocation Public symbol Absolute starting address Length Public symbol sorted by name/offset What if source too big?