8-bit MicrocontrollersのトピックRe: High-Address into the accumulator in asm using only LDA

High-Address into the accumulator in asm using only LDA

Brax02 — Fri, 22 Mar 2013 13:48:39 GMT

Hello,

I have declare a table like that.

ABC: DC.W $1234

The address of ABC is in my example 0xF200

I want to load in the accumulator 0xF2 only using a LDA command.

LDA #ABC==> A=0x0, 0x0 is the LSB of the address and not the MSB of the address 0xF2

How can i do that ?

for sure I can do something like but it's not the goal.

LDHX #ABC ; HX = F200

PSHH

PULA ;A=0xF2

implicit — Fri, 22 Mar 2013 14:35:36 GMT

I believe you want to use the HIGH operator in this case, at least for CodeWarrior's built-in HCS08 assembler.

E.g.

LDA #HIGH(ABC)

Brax02 — Fri, 22 Mar 2013 14:43:49 GMT

I was exactly looking for that ! Thanks a lot !!

bigmac — Mon, 25 Mar 2013 01:10:09 GMT

Hello,

The following alternatives should also work -

lda #(ABC/256)

lda #(ABC>>8)

The calculation is done during assembly.

Regards,

Mac