SOFTWARE DESCRIPTION Source Program Format program made line
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INTRODUCTION CORE ADRESSING MODES PERIPHERALS SOFTWARE TOOLS HARDWARE TOOLS STVD7
SOFTWARE DESCRIPTION
Source Program Format
program made lines. Each assembler line consists fields
label field: identifying label operation field: contains word which specifies action performed assembly process operand field: constitued quantity (number register) which operation performed comment field: comment concerning line
substract Label
#$22
substract value hold Comment
Operand Operation
INHERENT
code fully specify required information process operation (The inherent instructions single byte long). Example
Reset Carry Flag Reset Stack Pointer HALT consumption modes TRAP Enter software interrupt Return IRET -Interrupt Return Interrupt Mask Reset Interrupt Mask PUSH Stack operation
IMMEDIATE ADDRESSING MODE
#$FF #%01001110 #255
Example Before Completion After Completion
Previous value
#$55
SHORT DIRECT ADDRESSING MODE
ADDRESSABLE SPACE:
variable variable variable
Example
label symbol defined
Before Completion
After Completion
$086
label
$086
LONG DIRECT ADDRESSING MODE
ADDRESSABLE SPACE: 0000 FFFF
VARIABLE VARIABLE
Example
label symbol defined $F1D6
Before Completion $F1D6 LABEL
After Completion
OFFSET INDEXED ADDRESSING MODE
ADDRESSABLE SPACE:
Example
Before Completion
After Completion
SHORT INDEXED ADDRESSING MODE
ADDRESSABLE SPACE
(variable, SWAP (variable,
Example
label symbol defined
Before Completion
After Completion (label,
LONG INDEXED ADDRESSING MODE
ADDRESSABLE SPACE: 0000 FFFF
(variable, (variable,
Example
label symbol defined $2E6D
Before Completion $2E6D $2E6E $2E6F $2E70
After Completion
(LABEL,
SHORT INDIRECT ADDRESSING MODE
ADDRESSABLE SPACE:
[variable] [variable]
Example
label symbol defined
Before Completion SWAP [label]
After Completion
LONG INDIRECT ADDRESSING MODE
ADDRESSABLE SPACE: 0000 FFFF
[variable.w] [variable.w]
Example
label symbol defined
Before Completion $42E5 [label.w]
After Completion
SHORT INDIRECT INDEXED
ADDRESSABLE SPACE:
([variable], ([variable],
Example
label symbol defined
Before Completion $0C8 $0FE $0FF $100 $101 $102 ([label],
After Completion $0C8 $0FE $0FF $100 $101 $102
LONG INDIRECT INDEXED
ADDRESSABLE SPACE 0000 FFFF
([variable.w], ([variable.w],
Example
label symbol defined
Before Completion $42E5 ([label.w],X,)
After Completion
RELATIVE ADDRESSING MODE
DIRECT ADDRESSABLE SPACE: PC-128 PC+127
JRUGE label CALLR label .label JRMI label
INDIRECT ADDRESSABLE SPACE: PC-128 PC+127
JRNC [label] [label]
.label
JRMI [label]
MANIPULATION
DIRECT ADDRESSABLE SPACE: variable
variable BSET variable,
INDIRECT ADDRESSABLE SPACE: variable
BRES [variable],
RELATIVE JUMP TEST
DIRECT ADDRESSABLE SPACE: variable
BTJT variable, label
Relative jump label range PC128 PC+127
INDIRECT ADDRESSABLE SPACE: variable
BTJF [variable], label
Execute next instruction
SHIFT ROTATE INSTRUCTIONS
ADDRESSING MODES Summary
ESSI
ffse tive tive tive tive
#$0F 01001110 ([va ([va ([va
lica lica 0000.F 00.F 000.1F 0000.F 00.F 0000.F 000.1F 0000.F -128/+ -128/+ 00.F 00.F 00.F 00.F
00.F
EXERCICES ADDRESSING MODES
What content registers after execution instructions Before Completion
X,(Label,X) Y,([Label],Y)
el2:
ress
$009F $00A $00A
$00A $00A $00A $00A $00A $00A
A,([Label2.w],Y)
After Completion
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