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Jet Hughes 2022-07-29 10:33:34 +12:00
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content/notes/05-6809-assembly.md
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@ -4,8 +4,8 @@ aliases:
tags: tags:
- lecture - lecture
- cosc204 - cosc204
sr-due: 2022-07-29 sr-due: 2022-08-05
sr-interval: 3 sr-interval: 7
sr-ease: 250 sr-ease: 250
--- ---
@ -102,7 +102,7 @@ The programmer's model of a computer is not the same as the hardware model. The
- e.g., return from subroutine (`rts`) - e.g., return from subroutine (`rts`)
- and (optionally) parameters called **operands** - and (optionally) parameters called **operands**
- e.g., GOTO (`bra more`) - e.g., GOTO (`bra more`)
- instuctionsare often of different lengths - instuctions are often of different lengths
- `rts` one byte on the 6809 - `rts` one byte on the 6809
- `bra more` is two bytes on the 6809 - `bra more` is two bytes on the 6809
- On ARM32 they are all 32-bits (4 bytes) - On ARM32 they are all 32-bits (4 bytes)
@ -123,7 +123,7 @@ The programmer's model of a computer is not the same as the hardware model. The
- `lda #$0F` - `lda #$0F`
- Load A with the value stored at memory location $000F - Load A with the value stored at memory location $000F
- This is like: `A = memory[0x0F]` - This is like: `A = memory[0x0F]`
- `lda $0F$` - `lda $0F`
- Transfer the value stored in B into A - Transfer the value stored in B into A
- This is like `A = B` - This is like `A = B`
- `tfr b,a` - `tfr b,a`